Mother Recruited Her 16-Year-Old Son to Kill Her Love Rival in 1991 Murder

‘Guilty of Love’: The Chilling Murder Case That Put a Mother and Her Teenage Son on Trial

For years, Rene Sampat wanted a married driving instructor who did not want her back. She joined his church, showered his children with gifts and sent poison-pen letters aimed at destroying his marriage.

Then, prosecutors said, obsession became a murder plan, and Sampat brought her 16-year-old son into it.

There was nothing accidental about the hatred that eventually ended Janet Marshall’s life.

Years before the 36-year-old Sunday school teacher was found murdered in her north London home, another woman had become increasingly obsessed with her husband, Ancell Marshall, a driving instructor.

That woman was Rene Sampat.

And when Sampat failed to win the married man for herself, prosecutors said she reached a horrifying conclusion: his wife had to die.

What followed became one of Britain’s most disturbing murder cases of the early 1990s because Sampat did not simply find someone to carry out the killing.

She recruited her own teenage son.

Roy Aziz was 16 when his mother involved him in the murder of Janet Marshall. Three years later, in February 1994, both mother and son were convicted.

Sampat, then 37, was sentenced to life imprisonment, while Aziz, who was 18 by the time of sentencing, was ordered to be detained at Her Majesty’s pleasure.

It began with a driving lesson

Sampat first met Ancell Marshall in 1985 when she became a pupil at his driving school.

Marshall was married to Janet and had a family. He was also deeply involved in his Christian community, working as a home missionary and counsellor at his Seventh Day Baptist church.

But Sampat became intensely attached to him.

According to the prosecution at her trial, she tried repeatedly to get closer to Marshall and his family. She joined the church where he worshipped. She gave gifts to his children.

She made efforts to impress the family.

And when those efforts did not produce the relationship she wanted, her behaviour became increasingly disturbing.

Prosecutors told the court that Sampat made three separate allegations that she had been raped, apparently as part of her attempts to gain Marshall’s sympathy.

She also began sending poison-pen letters designed to create suspicion and conflict within the Marshall household.

One of those letters contained an especially chilling threat. It warned that Janet would die within a year of giving birth to her fourth daughter.

Janet’s death came only days before that one-year period expired.

The marriage she wanted

The prosecution’s case was straightforward in its alleged motive. Sampat wanted Ancell Marshall. But Marshall had a wife.

According to prosecutor Nigel Sweeney, Sampat eventually decided that removing Janet would clear the obstacle between herself and the man she wanted.

The case was therefore not presented as a random killing or an attack arising from a sudden quarrel. It was portrayed as the culmination of years of fixation and deliberate attempts to interfere with the family.

The Marshalls were described in court as a stable couple with a loving relationship.

Ancell had two businesses, including his driving school and a takeaway food shop, and remained active in his church.

Janet was a Sunday school teacher. Their home, however, had already become the target of an unseen campaign of intimidation.

The poison-pen letters

The letters initially appeared to be one of the many unexplained disturbances surrounding the family. They later became crucial.

A subsequent account of the investigation reported that Sampat was responsible for the poison-pen letters and that forensic evidence linked her to them.

Investigators also learned that a set of house keys had disappeared from the Marshall home during one of Sampat’s visits.

At the time, the missing keys did not appear to have obvious significance.

Later, investigators concluded that Sampat had taken the keys, had them copied and subsequently returned them.

The significance became apparent only after the murder.

According to the later reconstruction of the case, Sampat gave the copied keys to her son, enabling him to enter the Marshall home.

A detail that had once seemed almost trivial had become evidence in a murder investigation.

Janet was killed in her own home

In April 1991, Janet Marshall was murdered inside the family home in north London. She was repeatedly stabbed and strangled.

The circumstances initially pointed investigators towards someone close to her. Her husband became the principal suspect.

Ancell Marshall was arrested and charged with murdering his wife. He spent two months in custody. The suspicion against him became so serious that he was even prevented from attending Janet’s funeral.

Then came the first trial.

And the case began to unravel.

The husband was accused, but he was innocent

At Ancell Marshall’s trial in February 1992, Sampat gave evidence for the prosecution. But Marshall was cleared. His acquittal forced investigators to confront a devastating possibility: they had been pursuing the wrong man.

A second investigation followed. Detectives began looking again at the events surrounding Janet’s murder.

The poison-pen letters came back into focus. So did Sampat’s obsession with Marshall. So did the missing house keys. The investigation eventually led detectives to Sampat and her son.

A later academic examination of homicide investigations cited the Janet Marshall case as an example of how seemingly unrelated details can become significant when investigators reconstruct a victim’s life and the events leading up to a killing.

It noted that the copied keys, the letters and Sampat’s earlier fixation on Marshall all became relevant after her conviction.

The son became part of the plan

The most disturbing element was Roy Aziz’s involvement. He was only 16 when the murder took place. The prosecution alleged that Sampat recruited him to kill Janet.

According to the later reconstruction of the case, the teenager used the copied keys to gain access to the Marshall home.

Janet was then attacked in her own house. The killing was not discovered as part of some immediate confrontation between Sampat and her supposed rival.

Instead, the evidence eventually pointed towards a carefully prepared attack carried out by someone who had been given access to the home.

For the Marshall family, the horror was compounded by the fact that suspicion initially fell on Janet’s husband.

A murder that almost destroyed the wrong man

The first investigation had consequences beyond Janet’s death. Her husband was charged with killing the woman he had married. He spent two months in custody. He was unable to attend her funeral. He eventually stood trial and was cleared.

When the second investigation exposed the alternative theory of the murder, the scale of the investigative failure became clear.

At Sampat’s sentencing, Judge Richard Lowry called for further investigation into the first inquiry, saying it had resulted in an innocent man being charged with his wife’s murder.

The detective who led the second investigation, Detective Superintendent Gavin Robertson, also acknowledged that mistakes had been made.

The task of the second team was therefore not merely to identify the real killers. It was also to correct a failure that had already placed an innocent husband at the centre of a murder case.

Sampat’s chilling final words

On February 16, 1994, Sampat was convicted of Janet Marshall’s murder. As she was taken to the cells at the Old Bailey, she continued to deny the killing.

But her statement was extraordinary. “I am not guilty of murder – I am guilty of love,” she shouted, according to the contemporary report.

The words captured the central feature of the prosecution’s case.

Sampat’s fixation on Ancell Marshall had begun years earlier as an attachment to a driving instructor. It evolved into attempts to penetrate his family life.

Then came allegations, poison-pen letters and the threat against Janet.

Eventually, prosecutors said, it became murder. And her teenage son became part of the plan.

The warning hidden in the investigation

The Janet Marshall case has since appeared in academic discussions of homicide investigation because of the way apparently minor pieces of information acquired significance when examined together.

The missing keys. The poison-pen letters. The former driving pupil who had become obsessed with the driving Instructor.

The absence of obvious forced entry. The initial suspicion of the husband.Individually, some of these details might have appeared inconclusive.

Together, after the second investigation, they helped investigators reconstruct what had happened.

The case remains a disturbing example of how an obsession can move beyond private fantasy into deliberate interference, manipulation and, ultimately, lethal violence.

Janet Marshall was killed because the woman who wanted her husband allegedly came to regard her as the obstacle that had to be removed.

But the murder also demonstrated another danger: when investigators fixate too quickly on one suspect, an innocent person can become trapped inside the investigation while the real story remains hidden.

The second inquiry eventually exposed that story. By then, however, Janet Marshall was dead, her husband had endured a wrongful prosecution, and a 16-year-old boy had been drawn into a murder that would define the rest of his life. ValidViewNetwork reports.