One of the first out gay DJs on BBC Radio 1 died after taking large quantities of ecstasy, cocaine and GHB.
Postmortem results on Kevin Greening, 44, indicate he suffered a heart attack.
An un-named man in his 50s was arrested at the Wandsworth address where Greening’s body was found on Saturday evening and questioned by detectives on suspicion of murder and possession with intent to supply Class A drugs.
While he is no longer suspected of murder, he has been bailed to return in March pending further inquiries.
Greening co-presented Zoe Ball’s breakfast show on Radio 1 between 1997 and 1998.
He later worked on Radio 5 Live and Smooth Radio.
He was known for an irreverent style and created a number of fictional characters including a DJ called Raymond Sinclair.
Last week BBC Radio 5 Live’s Simon Mayo paid tribute to him.
“I only got to know him when he joined Radio 1 but it was quite clear that he was a fantastically bright individual. He had a great brain.
“He had a very, very dry sense of humour and he was quite shy really, sometimes embarrassed about having achieved the level of fame that he did have.
“Anyone who listened to his programmes could tell he was extremely bright, extremely clever. If he had a 40-second voiceover for his first record he would probably put in eight, nine, 10 little funny bits just to get the whole thing going.
“He was a fantastic example as to how much work should go into a programme. He was naturally gifted, and I frankly find it rather hard to believe that he’s not with us any more.”