Baby Boy Doe Case Update: Dianne Curry Peck and DNA

For more than four decades, an infant found in the woods of Mansfield, Massachusetts, was known only as “Baby Boy Doe.” In 2026, forensic genetic genealogy reopened the 1985 cold case, and a Bristol County grand jury indicted Dianne Curry Peck on one count of murder. She has pleaded not guilty. She is charged, not convicted, and every account attributed to prosecutors below remains an allegation unless it is independently established in court. She is presumed innocent unless and until the Commonwealth proves guilt beyond a reasonable doubt.

What This Case Is

This is a 1985 cold case that returned to court in 2026. The infant at its center was discovered in Mansfield and remained unidentified for more than forty years. Advanced DNA work and genealogical research eventually pointed investigators toward a biological mother, and the Commonwealth brought a single count of murder against Dianne Curry Peck.

A charge is an accusation brought by the Commonwealth. It is not proof of anything. What follows separates the parts of this case that are established in the public record from the parts that remain the prosecution’s account, and it explains what the next scheduled hearing will and will not decide.

Who Baby Boy Doe Was

For more than four decades, the infant was known publicly as “Baby Boy Doe,” a placeholder used because authorities did not have a personal name to give him. He remains the reason this case exists.

He was a newborn boy who, according to the medical and investigative account, lived briefly and died in January 1985. For forty-one years he went without his family name. Authorities have not publicly released a personal name for him. Whatever the court eventually decides about criminal responsibility, the case begins and ends with a child who lived, died, and was left unidentified for more than four decades.

The Identification Chain, Stated Precisely

The public technical trail is a chain of separate steps, not a single “DNA match.” Our guide to how forensic genetic genealogy works explains how distant DNA matches can generate an investigative lead that still requires conventional confirmation.

• The cold case was formally revisited. The Bristol County District Attorney’s Office expanded its work on unidentified remains and cold cases in 2022, and the Mansfield infant’s case was among those reexamined.
• Evidence was submitted for advanced DNA testing. According to Othram, the Bristol County District Attorney’s Office, Massachusetts State Police, and FBI submitted evidence from the infant’s remains to Othram in 2024.
• Othram built a genome-wide SNP profile. Othram states that its scientists used Forensic-Grade Genome Sequencing to develop a comprehensive single-nucleotide-polymorphism profile suitable for forensic genetic genealogy. That is different from a standard CODIS profile; a SNP profile supplies many more genetic markers and can support family-tree research through genetic-genealogy methods.
• The FBI conducted the genealogical search. Othram says the resulting profile was used by the FBI’s forensic genetic genealogy team, which used genetic relationships and family-tree research to develop investigative leads. The announced record does not identify which genealogy database was used, how many relatives were found, the relationship level of any match, the exact family-tree path, the raw sequencing metrics, or the laboratory validation statistics.
• Investigators developed Peck as a lead. Prosecutors said the genealogy work pointed investigators toward Dianne Curry Peck, who had been a 17-year-old Mansfield High School student in January 1985. A genealogy lead is not, by itself, proof that a particular person committed a crime. It is an investigative direction that must be checked through conventional evidence.
• A discarded-item DNA sample was used for confirmation. At arraignment, prosecutors alleged that investigators collected discarded trash from Peck’s home in 2024 and obtained DNA from a soda bottle, and that testing supported the conclusion that she was the infant’s biological mother. The publicly announced information does not include the underlying laboratory report, statistical likelihood ratio, chain-of-custody documentation, or analyst testimony.
• Traditional investigation continued. Public reports state that investigators interviewed Peck in August 2025. Prosecutors gave an account of statements they say she made concerning a concealed pregnancy, the birth, and her former boyfriend. Those assertions are the prosecution’s account and have not been tested at trial. Authorities also said the infant’s biological father was identified and is deceased.

The most precise formulation is that Othram generated the SNP profile that enabled the genealogical work, the FBI performed the publicly described genealogy, and law enforcement says follow-up DNA and conventional investigation supported the identification. The genealogy work supplied a lead, not proof of guilt; the criminal charge must still be tested through ordinary evidence and the court process. How DNA Remembers gives readers a visual, plain-language bridge from shared DNA to a narrowed family tree without treating a genealogy match as a courtroom verdict.

The Charging Record

• Charge: One count of murder.
• Indictment: June 29, 2026, by a Bristol County grand jury.
• Arraignment: June 30, 2026, in Fall River Superior Court.
• Plea: Not guilty.
• Release conditions publicly reported: $100,000 surety or $10,000 cash; reports also state that Peck surrendered her passport.
• Next publicly reported event: A pretrial conference publicly scheduled for August 31, 2026.

A note on dates matters here: the grand-jury indictment was announced June 29; June 30 was the arraignment and not-guilty plea. June 30 is not the indictment date.

Although the indictment drew a short burst of news coverage, continuing case coverage remains unusually sparse. Most outlets have not built a dedicated tracker or returned to the case since the arraignment.

What the August 31 Conference Will Decide

A pretrial conference is where the court addresses scheduling, discovery, motions, and other issues before any trial date is set. The next scheduled court date is not a trial, and it is not a hearing at which guilt is decided.

A pretrial conference is an early case-management stage. The judge and lawyers use it to determine what information has been exchanged, what remains disputed, which motions may need to be filed, and what schedule the case should follow. For an infant at the center of a 41-year-old investigation, the hearing may be the first public sign of how that investigation will be converted into evidence that can — or cannot — be used in a courtroom.

Massachusetts criminal rules require the prosecution to provide the defense with broad categories of relevant material, which can include police reports, recorded or written statements, laboratory material, photographs, witness information, and evidence that may help the defense. In this case, discovery could be unusually large and technically demanding, reaching back to 1985 and reportedly including preserved biological evidence, modern genome sequencing, forensic genetic genealogy, confirmatory DNA testing, historical records, and interviews conducted decades later.

The most meaningful things to watch on August 31 would be whether the date remains on the court calendar, whether counsel reports that automatic discovery is complete, whether either side identifies missing DNA, genealogy, medical, or interview material, whether motion deadlines are set, whether an evidentiary hearing is scheduled, whether release conditions change, and whether the court sets a final pretrial conference or trial date. None of those outcomes should be predicted. The hearing may be brief and administrative, particularly in a complex case at an early stage.

The Presumption of Innocence

Dianne Curry Peck has pleaded not guilty to one count of murder. The charge is an accusation. She remains presumed innocent unless prosecutors prove guilt beyond a reasonable doubt in court. The pretrial conference will not answer who is criminally responsible for the infant’s death. It will begin defining which evidence can be tested, which legal disputes require rulings, and how the case will move forward.

The August 31 date is publicly scheduled based on contemporaneous reporting. A fresh, line-by-line docket entry confirming that date was not independently retrievable for this update, and no later schedule change was found.

Sources

• CBS Boston — Mansfield 1985 cold case, Dianne Curry Peck (updated July 1, 2026)
• Fall River Reporter — Local woman accused of murdering newborn son granted bail (June 30, 2026)
• People — Rabbit hunters found a dead newborn in 1985; now a woman is charged (June 30, 2026)
• WCVB — Woman arraigned in 1985 Mansfield newborn death (updated June 30, 2026)
• NBC10 Boston — Woman charged with 1985 murder of newborn son (June 29–30, 2026)
• Othram / DNA Solves — Bristol County, Massachusetts 1985 Baby Doe (June 30, 2026)
• Forensic Magazine — Genealogy leads FBI to 1985 Baby Doe’s mother (July 1, 2026)
• Massachusetts Court System — Search Court Dockets, Calendars and Case Information
• Massachusetts Rules of Criminal Procedure, Rule 11 — Pretrial conference and pretrial hearing
• Massachusetts Rules of Criminal Procedure, Rule 14 — Pretrial discovery from the prosecution