A mysterious London Underground menace convicted of only two murders may have been one of Britain's most prolific serial killers.
Kieran Kelly, from Ireland, was jailed and spent more than three decades behind bars for the murders.
But Kelly, who died in 2001, is thought to have been responsible for more than 29 deaths around London in the 1970s.
He witnessed a suspiciously high number of "suicides" on the Tube, and it's now suspected he had pushed his victims onto the train tracks and then waited for police officers to arrive at the scene.
In his statements, he claimed that the victims spoke to him about their mountain of issues such as money problems or marital issues, before stepping in front of an oncoming train.
But the Metropolitan Police detective Geoff Platt, who led the 1984 investigation into Kelly's murders, believes he was responsible for far more deaths than he was convicted for - and may be the most prolific serial killer in British history.
Platt told the Daily Star in 2015: "He was high – high on adrenaline, testosterone…aroused. You could see it in his eyes. He was proud of that murder and when we went to speak to him he just confessed to killing 16 other people.”
His first alleged victim was his best friend at the time, Christy Smith.
It has been suspected that Kelly pushed Smith in front of a train after he commented on Kelly's unmarried status.
Kelly was 30 at the time and still unmarried, and had interpreted the comment by Smith as accusing him of being a closeted homosexual.
Platt claims that the comment angered Kelly to the point of murder, however he was never convicted for it.
He said Kelly had feared that same-sex relations were a sin "that led to hellfire and damnation."
Smith's death is even reflected in his other suspected victims who were often gay men, police informants or men who had reminded him of Smith himself.
Kelly was finally arrested and convicted for the murder of Hector Fisher after a robbery, who was found dead in Clapham Common in 1983.
And while in custody, Kelly went on to murder his own cellmate.
William Boyd was killed in 1983 by Kelly for supposedly snoring in their shared cell.
Finally, in 1984, Kelly was convicted and sentenced for both of these murders.
But mystery still remains over his supposed 29 other victims.
Their families had not even been able to claim insurance as their deaths had all been ruled suicides.
In Platt's book he published in 2015, he claimed Kelly had a murder total of 31 people.
However, Platt's figure has been disputed by Irish journalist Robert Mulhern who believes his total is less - around five or six people.
Since Platt's book was published, the families of more potential victims have come forward as questions still remain unanswered.
