Constance Marten – Case Timeline, Verdict, and Sentence

Constance Marten and Mark Gordon were sentenced to 14 years in prison in September 2025 for the gross negligence manslaughter of their newborn daughter, Victoria. The case, which began with a burning car and a nationwide police search, has raised complex questions about child protection, family court transparency, and the limits of parental autonomy.

The couple disappeared in early 2023 with their baby, deliberately avoiding contact with authorities and social services. Their daughter died of hypothermia while they were living in a tent on the Brighton Downs in freezing conditions. The case has since gone through two trials, multiple family court hearings, and has become the subject of widespread media coverage.

On September 15, 2025, at the Old Bailey, both defendants were sentenced to 14 years’ imprisonment. Mark Gordon received an extended sentence of 18 years, comprising 14 years in custody and four years on extended licence, reflecting his assessed risk profile. Constance Marten received a determinate 14-year sentence.

Who Is Constance Marten?

Constance Marten is the daughter of Sir John Marten, a baronet, placing her within the British aristocracy. Born in 1987, she was 38 at the time of sentencing. She cut ties with her family at some point before the events that led to the trial, and her relationship with Mark Gordon placed her in a world far removed from her privileged upbringing.

Mark Gordon is a US-born man with a serious violent criminal history. He had previously served 22 years in a Florida prison for rape and was on the sex offenders register in the United States. The couple’s relationship and their decision to go off-grid together became a central focus of the trial.

Court reporting from the family court also revealed a previous incident in which a judge found, on the civil standard of proof, that Gordon was responsible for Marten’s fall from a first-floor window while she was pregnant. That finding formed part of the broader picture of concern about the couple’s relationship and parenting capacity.

Who Are Constance Marten’s Brothers and Family?

Marten has several siblings, but their names and personal details have not been widely reported in mainstream media coverage. The family’s preference for privacy during the trial has meant that little public information exists about her brothers or her wider family network beyond her father, Sir John Marten.

How Old Is Constance Marten?

Constance Marten was born in 1987 and was 38 years old at the time of her sentencing in September 2025. She was 35 or 36 when she gave birth to Victoria in late 2022 or early 2023.

What is Known About the Psychology of Constance Marten?

No official psychological evaluations of Constance Marten have been publicly released. Reporting and commentary have noted the apparent control Gordon exercised over her, her isolation from family, and the couple’s shared determination to avoid state intervention. However, these observations remain speculative in the absence of disclosed expert assessments.

What Did Constance Marten and Mark Gordon Do?

The couple’s actions centred on a deliberate attempt to evade authorities after the birth of their daughter. They hid the pregnancy, did not register the birth, and lived a nomadic existence in an effort to keep the child away from social services. According to reporting from the BBC and the Crown Prosecution Service, the couple were trying to avoid any form of state intervention in their lives.

Why Did They Disappear?

Court material and reporting indicate that Marten and Gordon were determined to keep the baby hidden from social services. They had already been the subject of family court proceedings concerning other children, and concerns had been raised about their parenting capacity and the safety of their children. A family court judge had previously found that Gordon was responsible for Marten falling from a first-floor window while she was pregnant.

The couple’s car was found burning near Bolton, Lancashire, in January 2023. This incident triggered a major police search. Rather than seeking help, the couple fled with their newborn and lived in a tent on the Brighton Downs in difficult and unsafe conditions.

What Happened to the Baby?

Baby Victoria died in January 2023. The cause of death was hypothermia, according to the judge’s sentencing remarks. She died while the couple were living in a tent in freezing temperatures on the South Downs near Brighton. No other injuries were reported in connection with her death.

The couple were arrested in February 2023 after police found their tent. Victoria’s body was discovered at the scene. The case became a major criminal prosecution, with the Crown Prosecution Service confirming the manslaughter conviction and the sentencing details.

What Was the Verdict and Sentence?

The legal process took more than two years from the discovery of Victoria’s death to the final sentencing. The case involved two trials: the first in 2024 resulted in partial convictions but a hung jury on the most serious charge, while the second in 2025 produced a unanimous verdict of gross negligence manslaughter.

The First Trial (2024)

At the first trial, the jury found Marten and Gordon guilty of concealing the birth of a child, child cruelty, and perverting the course of justice. However, they could not reach a verdict on the charge of gross negligence manslaughter. The judge ordered a retrial on that single charge.

The Retrial (July 2025)

The retrial concluded in July 2025 with unanimous guilty verdicts for gross negligence manslaughter against both defendants. The verdict brought to an end a lengthy and closely watched legal process at the Old Bailey.

The Sentencing (September 2025)

On 15 September 2025, the judge sentenced both defendants to 14 years in prison. For Mark Gordon, the sentence was structured as an 18-year extended sentence, with 14 years to be served in custody and an additional four years on extended licence, reflecting his assessed risk and previous criminal history. Constance Marten received a determinate 14-year sentence with no extended licence period.

The judge noted the seriousness of the offence and the significant harm caused by the couple’s deliberate failure to provide adequate care for their daughter. The full sentencing remarks were published by the judiciary.

What Is the Constance Marten Documentary on iPlayer?

A documentary covering the case is available on BBC iPlayer. It explores the background of both defendants, the timeline of events, the trial, and the broader implications of the case. The BBC also published a long-form feature article with multimedia elements, including an interactive timeline and video explainers.

The documentary and the accompanying BBC coverage have played a significant role in shaping public understanding of the case. However, beyond the BBC’s extensive reporting, the search results do not clearly identify a specific standalone documentary title in the material provided. Additional media coverage from Sky News, The Independent, and other outlets has also contributed to the public record.

What Is the Full Timeline of the Constance Marten Case?

1. Late 2022: Marten becomes pregnant. The couple go into hiding and avoid contact with authorities.
2. January 2023: Baby Victoria is born. The couple’s car is found burning near Bolton, Lancashire. They disappear with the baby.
3. February 2023: Police find the couple’s tent on Brighton Downs. Baby Victoria is dead. Marten and Gordon are arrested.
4. 2023–2024: Pre-trial hearings take place. Family court proceedings regarding the couple’s other children continue.
5. 2024: The first trial at the Old Bailey ends with convictions for concealment of birth, child cruelty, and perverting the course of justice. The jury cannot reach a verdict on manslaughter.
6. July 2025: A retrial concludes with unanimous guilty verdicts for gross negligence manslaughter against both defendants.
7. 15 September 2025: Sentencing at the Old Bailey. Both are jailed for 14 years. Gordon receives an additional four-year extended licence period. Family court judgments concerning the children are published.

What Do We Know and What Remains Unclear?

What Is the Wider Context of the Case?

The case has legal significance because it sits at the intersection of child protection, criminal justice, and family law. The family court’s decision to permit publication of its judgments concerning the children of Marten and Gordon marks a rare instance of transparency in cases involving the children of convicted parents. Doughty Street Chambers reported on this development in July 2025.

The social background of the defendants has drawn considerable media attention. Marten’s aristocratic roots and Gordon’s violent criminal history created a stark contrast that fuelled public interest. The couple’s decision to live off-grid and their determined avoidance of state intervention also raised questions about the limits of parental autonomy and the obligations of the state to protect vulnerable children.

The case has already generated policy discussions about child protection and the challenges of monitoring families who choose to live outside conventional systems. Whether these discussions will lead to legislative or procedural changes remains to be seen.

What Are the Key Sources and Quotes?

“The chaotic lives of Constance Marten and Mark Gordon”

BBC News

“Constance Marten and Mark Gordon both jailed for 14 years over death of baby in tent”

The Guardian

“Family Court permits publication of judgments concerning children of Constance Marten and Mark Gordon”

Doughty Street Chambers

The full sentencing remarks are available from the Judiciary UK website. Comprehensive overviews of the case have been published by Wikipedia and by BBC News. The Crown Prosecution Service has also confirmed the conviction and sentencing details. The Guardian reported extensively on the sentencing hearing. The official sentencing judgment provides the definitive legal record. Doughty Street Chambers published details of the family court’s decision to release its judgments concerning the children.

What Comes Next for Marten and Gordon?

Both defendants are now serving their sentences. Under the terms of the determinate sentence, they may be eligible for release after serving two-thirds of the 14-year term. Gordon’s extended licence period means he will remain under supervision for four years beyond his custodial term. It remains possible that either defendant will appeal the conviction or the sentence. The family court proceedings regarding the couple’s other children are ongoing, and the publication of the judgments has brought a degree of transparency to that process. The case may also lead to broader policy discussions about child protection and the challenges of monitoring families who deliberately avoid contact with state services. For related UK criminal case coverage, see Roksana Lecka – Nursery Worker Jailed for Abusing 21 Babies and Owen Hart – The Accident, Family, and Lasting Legacy.

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