A man has been convicted of murdering four young men whom he poisoned so that he could have sex with them while they were unconscious.
Stephen Port, a chef, was found guilty at the Old Bailey of killing Anthony Walgate, 23, Jack Taylor, 25, Daniel Whitworth, 21, and Gabriel Kovari, 22.
The serial killer sought his victims on dating websites including Grindr and dumped their bodies in or near a graveyard within 500 metres of his flat in Barking, east London.
He disposed of their mobile phones, repeatedly lied to police and planted a fake suicide note in the hand of one of his victims, taking the blame for the death of another.
The 41-year-old denied all the charges against him but was found guilty of the murders as well as a range of sexual offences against more men.
Mr Taylor's parents and sisters wept in court as the guilty verdicts were delivered, but Port did not react.
He was convicted of a total of 16 offences against nine out of 12 alleged victims, including the three murders.
Other charges he was found guilty of included seven counts of administering a substance, three rapes and three sex assaults.
Detective Chief Inspector Tim Duffield said: "Stephen Port is probably one of the most dangerous individuals I've encountered.
"He's a voracious sexual predator who appears to have been fixated, nay obsessed, with surreptitiously drugging young, often vulnerable men for the exclusive purpose of rape.
"From what we've seen as an investigation team, this is a highly devious, manipulative and self-obsessed individual.
"Throughout both the criminal investigation, many days of police interviews and during the course of a long trial, he has never once shown a shred of remorse for his victims or indeed their families."
Commander Stuart Cundy, from the Met's Specialist Crime and Operations command, added: "From the evidence we've heard at trial there were potential opportunities that were missed.
"The IPCC investigation will carefully consider those."
Nik Noone, chief executive of LGBT anti-violence charity Galop, said: "Our thoughts are with the friends and families of the young men who tragically lost their lives, the survivors that have come forward and those who are affected by the issues raised in this case.
"Our focus now turns to understanding what lessons need to be learnt from the police response to unexplained deaths and sexual assault of young men and what must be done to learn how to prevent someone like Port in the future."