Overview

• Full name: Tracy Sue Zandstra
• Also known as: Tracy Sue McAfee
• Date of birth: March 17, 1962
• Age at disappearance: 29
• Date last seen: November 16, 1991
• Last known location: 17195 Pine Street, Stirling City, California
• City: Stirling City
• County: Butte County
• State: California
• Case classification: Missing person / possible homicide; endangered missing
• Current status: Remains missing; homicide prosecution ended in acquittal on May 16, 2022
• Investigating agency: Butte County Sheriff’s Office
• Official sheriff’s case number: C91-17937
• California Department of Justice reference: C91017937
• Physical description: Approximately 5 feet 7 inches tall, 112 pounds, blonde hair, green eyes
• Distinguishing features: Butterfly tattoo on her right breast; a broken right finger at the time she disappeared
• Main circumstances: Tracy vanished from the home she shared with her boyfriend and two children. Authorities subsequently developed evidence supporting a suspected homicide, but her body has never been found.

Detailed Case Breakdown

Tracy Sue Zandstra: The 1991 Disappearance and Suspected Homicide in Stirling City, California

In the early morning hours of November 16, 1991, 29-year-old Tracy Sue Zandstra disappeared from her home in Stirling City, a small community in Butte County, California. She left behind two young children, her clothing, and her personal belongings. She was never seen or heard from again.

For nearly three decades, her disappearance remained an unresolved investigation. In August 2019, authorities arrested her former boyfriend, Richard Pyle, after investigators developed evidence indicating that Tracy had been killed. The case eventually reached a jury, but in May 2022, Pyle was acquitted of murder.

Despite the investigation, forensic evidence, and criminal trial, Tracy’s remains have never been recovered. Her disappearance remains unresolved, and the question of where she was taken continues to trouble the case.

Case Summary

• Full name: Tracy Sue Zandstra
• Also known as: Tracy Sue McAfee
• Date of birth: March 17, 1962
• Age at disappearance: 29
• Date last seen: November 16, 1991
• Last known location: 17195 Pine Street, Stirling City, California
• City: Stirling City
• County: Butte County
• State: California
• Case classification: Missing person / possible homicide; endangered missing
• Current status: Remains missing; homicide prosecution ended in acquittal on May 16, 2022
• Investigating agency: Butte County Sheriff’s Office
• Official sheriff’s case number: C91-17937
• California Department of Justice reference: C91017937
• Physical description: Approximately 5 feet 7 inches tall, 112 pounds, blonde hair, green eyes
• Distinguishing features: Butterfly tattoo on her right breast; a broken right finger at the time she disappeared
• Main circumstances: Tracy vanished from the home she shared with her boyfriend and two children. Authorities subsequently developed evidence supporting a suspected homicide, but her body has never been found.

Tracy Zandstra’s Background and Life Before Her Disappearance

Tracy Sue Zandstra was born on March 17, 1962. By November 1991, she was a 29-year-old mother raising two young children in Stirling City, a community in the wooded foothills of Northern California.

At the time of her disappearance, Tracy lived with her boyfriend, Richard Pyle, and her children at a residence on Pine Street.

Publicly available case records provide limited information about Tracy’s childhood, education, employment, and earlier relationships. Much of what is known about her life comes from law enforcement records and testimony presented during the criminal proceedings years after she vanished.

Her children were central to her life and later became important figures in the investigation into her disappearance.

Tracy was described as having blonde hair and green eyes. She stood approximately 5 feet 7 inches tall and weighed about 112 pounds. Investigators also documented a butterfly tattoo on her right breast and a broken finger on her right hand.

These identifying details remain significant because her remains have never been located.

The Disappearance on November 16, 1991

According to the Butte County Sheriff’s Office, Tracy’s last known location was her residence at 17195 Pine Street at approximately 2:00 a.m. on November 16, 1991.

Richard Pyle told investigators that Tracy left the residence at that time.

She did not return.

Her two young children remained at the house with Pyle. Tracy also left behind her purse, clothing, and other belongings.

The circumstances raised serious questions about whether she had left voluntarily. She had disappeared without her children or the possessions normally associated with an extended absence.

No independently confirmed sighting established where she went after leaving the residence, and investigators were unable to locate her.

The sheriff’s department eventually classified the matter as a missing-person investigation involving possible homicide.

Although some historical reporting uses November 15, 1991, the sheriff’s official missing-person record identifies approximately 2:00 a.m. on November 16 as her last known time at the residence.

Investigation History and Evidence

The Initial Missing-Person Investigation

Following Tracy’s disappearance, the Butte County Sheriff’s Office began investigating the circumstances surrounding her absence.

Investigators focused on the residence, her relationship with Pyle, and the possibility that she had been the victim of violence.

Pyle was considered a suspect early in the investigation, according to statements later made by Butte County District Attorney Michael Ramsey.

Despite the suspicions, investigators did not immediately have sufficient evidence to bring the case to trial.

Tracy’s body was never found, creating a substantial obstacle to determining exactly what happened and establishing the circumstances of her death.

Physical Evidence Recovered After the Disappearance

One of the most significant developments involved biological evidence recovered shortly after Tracy vanished.

During the 2022 trial, jurors heard testimony from California Department of Justice DNA experts concerning a piece of hair, scalp tissue, and blood discovered by a witness a few days after her disappearance.

Forensic testing identified the biological material as belonging to Tracy.

The discovery was significant because it provided physical evidence relevant to investigators’ theory that Tracy had been violently harmed.

However, identifying biological material as Tracy’s did not, by itself, establish who was responsible or precisely how she died.

The Role of DNA Testing

DNA evidence became an important part of the prosecution’s case decades after Tracy disappeared.

Investigators preserved biological material recovered during the original investigation, allowing forensic specialists to examine evidence in connection with the cold case.

At trial, experts testified about the identification of the recovered material.

The available official court-related reporting confirms the use of forensic DNA testing. It does not establish that investigative genetic genealogy was used, or that an unknown person’s DNA was identified through a genealogical database.

Those methods should not be confused with the forensic identification of Tracy’s own biological material.

Witness Statements and Allegations

The criminal proceedings also included testimony about statements allegedly made by Richard Pyle before Tracy disappeared.

According to the Butte County District Attorney’s Office, a witness testified that Pyle had made a threatening statement about Tracy approximately one or two days before her disappearance.

Jurors also heard evidence relating to Tracy’s children and the circumstances surrounding the home.

One particularly disturbing allegation emerged through earlier testimony from Tracy’s son. He had reportedly described being forced, as a child, to assist with the dismemberment and disposal of his mother’s body.

Tracy’s son died approximately two weeks before the trial began and therefore could not testify personally before the jury.

These accounts were evidence and allegations presented during criminal proceedings. They were not findings of guilt, and the jury ultimately acquitted Pyle.

The 2019 Arrest of Richard Pyle

On August 15, 2019, investigators arrested Richard Pyle in Stockton, California, nearly 28 years after Tracy’s disappearance.

Pyle, then 55, had been living as a transient, according to contemporary reporting.

The Butte County Sheriff’s Office worked with Stockton authorities to locate and arrest him after obtaining an arrest warrant.

Pyle was booked into the Butte County Jail, and his bail was initially reported as $1 million.

On August 19, 2019, authorities publicly announced the arrest.

Investigators stated that evidence gathered over the years supported their belief that Tracy had been murdered and her body disposed of.

The arrest represented a major development in a case that had remained unresolved since 1991.

However, an arrest and criminal charge did not establish Pyle’s guilt. The prosecution still had to prove the charge beyond a reasonable doubt.

The 2022 Murder Trial and Acquittal

Richard Pyle’s murder trial began on April 25, 2022, in Butte County.

The proceedings lasted eight trial days and involved testimony about forensic evidence, witness accounts, and events surrounding Tracy’s disappearance.

Prosecutors presented the biological evidence recovered after Tracy vanished and testimony concerning statements allegedly made before her disappearance.

The jury also heard testimony from Tracy’s daughter, Nicole, who was six years old when her mother disappeared.

The prosecution faced the challenge of presenting a homicide case without Tracy’s recovered remains.

On May 16, 2022, a Butte County jury found Pyle not guilty of murder.

The verdict ended that prosecution without a conviction. It did not establish what happened to Tracy or reveal the location of her remains.

The distinction is important: investigators’ belief that Tracy was killed, the evidence presented at trial, and the jury’s finding that the prosecution had not proved Pyle’s guilt beyond a reasonable doubt are separate matters.

No one should be described as convicted of Tracy’s murder.

Theories and Unresolved Questions

Was Tracy the Victim of Homicide?

The primary investigative theory has been that Tracy was killed around the time she disappeared.

That theory is supported by the suspicious circumstances of her disappearance, the recovery of biological material identified as hers, and the evidence described during the criminal trial.

Authorities have publicly treated the case as a suspected homicide, although Tracy’s remains have never been found.

Her official missing-person record also remains relevant because her location and the circumstances of her disappearance have not been conclusively resolved.

Where Are Tracy’s Remains?

One of the most important unanswered questions concerns the location of Tracy’s body.

The prosecution presented testimony involving an allegation that her remains had been dismembered and buried. However, that account did not lead to a publicly confirmed recovery of her remains.

No verified public source reviewed establishes a precise burial location.

Without a recovery, investigators have been unable to obtain the additional information that examination of her remains might provide.

What Happened Inside the Residence?

The home on Pine Street remains central to the case.

The biological evidence, Pyle’s account that Tracy left around 2:00 a.m., and the later witness testimony all raised questions about what occurred in and around the residence.

Nevertheless, the publicly documented evidence does not provide a complete, judicially established reconstruction of the events that night.

Could Additional Evidence Resolve the Case?

Preserved forensic material, undisclosed witness information, or credible new information about a possible disposal location could potentially assist investigators.

Modern forensic methods may offer opportunities to reexamine old evidence, but there is no verified public announcement establishing that a new forensic examination has produced a breakthrough since the trial.

Such possibilities remain investigative avenues rather than confirmed developments.

Latest Publicly Available Investigative Updates

Case information reviewed through October 28, 2026

May 16, 2022: Jury Returns Not-Guilty Verdict

The most consequential publicly verified legal development was Pyle’s acquittal on May 16, 2022.

The Butte County District Attorney’s Office confirmed that Pyle was discharged from custody following the verdict.

The district attorney’s official announcement also documented additional trial evidence, including testimony from Tracy’s daughter concerning a card that Pyle had supplied to law enforcement months after Tracy disappeared. The card purported to be from Tracy, but her daughter testified that its handwriting did not match her mother’s.

The same announcement confirmed that Tracy’s son, Robert Zandstra, had been murdered in Yuba County approximately two weeks before the trial. His prior testimony was presented to jurors.

Continued Missing-Person Records

Tracy remains listed in the California Department of Justice’s missing-person database under the name Tracy Sue Zandstra, with Tracy Sue McAfee identified as an alternate name.

The Charley Project also continues to maintain a profile describing her disappearance, physical characteristics, and the outcome of the murder prosecution.

These records preserve public awareness of her case. Their continued availability does not, by itself, establish that investigators have recently developed new evidence.

No Publicly Confirmed Recent Breakthrough

As of October 28, 2026, no publicly confirmed investigative breakthrough after the May 2022 acquittal was located in the sources reviewed.

Specifically, no verified subsequent announcement was found confirming the recovery of Tracy’s remains, a new arrest, additional criminal charges, a newly identified suspect, or a successful new forensic identification.

The absence of a public announcement does not necessarily mean that investigators have stopped examining information or pursuing leads. It means that no more recent development could be independently verified for this article.

Conclusion: The Search for Answers Continues

More than three decades after Tracy Sue Zandstra disappeared from her Stirling City home, the case remains unresolved.

Her disappearance left two young children without their mother. Years later, the investigation led to the arrest and prosecution of the man who had been living with her, but the jury’s acquittal meant that the criminal case ended without a conviction.

Tracy’s remains have never been recovered, and her family has not received a definitive public accounting of what happened to her.

The case illustrates both the importance of preserving evidence in long-running investigations and the difficulty of prosecuting an alleged homicide when the victim’s remains are missing.

Anyone with credible information about Tracy’s disappearance, her whereabouts after November 16, 1991, or the possible location of her remains is encouraged to contact the Butte County Sheriff’s Office.

Butte County Sheriff’s Office tip line: 530-538-7671

Sheriff’s case reference: C91-17937

Even information that appears insignificant may be valuable when considered alongside evidence collected during the original investigation.