A Kent man who was one of four allegedly killed by a gay serial murderer died from a drugs overdose, a court's heard.

Daniel Whitworth is alleged to have been drugged then murdered by Stephen Port, 41.

A court earlier heard the alleged serial killer filmed himself having sex with an unconscious man so he couldn't send text messages while high on drugs.

Stephen Port, 41, drugged young men with GHB so he could fulfil his sexual fetishes of raping while they were unconscious, it is claimed.

The chef allegedly sexually assaulted 12 men he met through Grindr and other dating sites between 2012 and 2015 at his flat in Barking, east London.

Four of his alleged victims - Anthony Walgate, 23, Gabriel Kovari, 22, Daniel Whitworth, 21, and Jack Taylor, 25 - died from drug overdoses.

The Old Bailey was told Port met one of the alleged rape victims through the dating site Manhunt in 2010, and they met a few times at his flat for sex.

They lost contact for a few years, but got back in touch and met up around Christmas 2014, jurors were told.

Videos were later recovered which apparently showed Port having sex with him while he was unconscious, including one shot on New Year's Eve 2014 which involved another man, jurors have heard.

Giving evidence today, Port said the alleged victim was "very submissive" when they had sex, and they would take drugs together.

Port said: "He was pretty aware what he was coming around for. He was fully aware."

When they had sex, Port would occasionally tie him up, but it was always consensual.

They arranged to have a foursome on New Year's Eve 2014 at Port's flat in Barking, east London, the defendant said.

Port said the man as being high on drugs, singing to himself and being "away with the fairies".

During the night, Port filmed himself and another man having sex with the alleged victim while he appeared to be unconscious.

Mr David Etherington, QC, defending, said: "Had you ever discussed with him the topic of having sex with him while he was asleep?"

He replied: "No. We started before he passed out. He was still singing to himself."

Mr Etherington said: "Had you asked him before if it was okay to have sex?"

Port responded: "He said do not disturb his sleep."

His defence barrister asked: "Did you explicitly ask him if it was okay, or are you saying you assumed it?"

Port said the man told him he "didn't care" so long as he was "still high", and claimed he told him afterwards about it.

Asked why he decided to film it, Port said it was because he fancied him, and because he had memory loss from taking drugs.

Port said: "When you take drugs, you remember it at the beginning and at the end, but you don't remember exactly what you did.

"It keeps the phone active. When you are high, you tend to send text messages and say things you otherwise wouldn't say.

"It keeps the phone busy. If the phone is recording, you cannot send messages."

He added: "He never expressed any unhappiness about being filmed."

Port denies four counts of murder, four alternative counts of manslaughter, ten counts of administering a substance with intent, seven counts of rape and four counts of assault by penetration.