A man was arrested and quizzed about the death of former Radio 1 breakfast DJ Kevin Greening, police said yesterday.
The man, in his 50s, was arrested at the address in Wandsworth, south London, where Greening's body was found on Saturday night, the Metropolitan Police said.
He was questioned on suspicion of possession with intent to supply Class A drugs and has been bailed pending further inquiries. A force spokeswoman said the death was being treated as "unexplained".
She said: "Police attended a residential address in Wandsworth at 8.49pm on December 29, following a call from the London Ambulance Service. A deceased man in his 40s was found at the address.
"Next of kin are aware, but we are awaiting formal identification.
"The death is being treated as unexplained at this stage.
"A man in his 50s was arrested at the scene in connection with the death on suspicion of possession with intent to supply Class A drugs, and has subsequently been bailed to return in March pending further inquiries."
She said a post-mortem examination carried out on Monday at St George's Hospital mortuary had not established a formal cause of Greening's death and police were waiting for the results of further tests.
The case is being investigated by detectives from the Specialist Crime Directorate, under Detective Chief Inspector Nick Scola.
Greening's agent, Chris North, announced the death on Sunday, telling the BBC the DJ died peacefully in his sleep.
Greening, 44, was paired with Zoe Ball on Radio 1's flagship show from 1997 to 1998.
He also worked on BBC Radio 5 Live and was most recently at Smooth Radio, over-seeing the weekday afternoon show at the London station.
BBC Radio 5 Live's Simon Mayo, who worked with Greening at Radio 1, told the station: "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."
Greening was part of the launch line-up of Virgin Radio in 1993. He had transferred to Radio 1 within a year, hosting weekend shows and standing in on daytime slots.
He became renowned for his tongue-in-cheek style and introduced comedy sketches to his programmes through a series of fictional characters, including a hapless DJ called Raymond Sinclair.
His stint with Ball lasted for only a year, and he returned to a weekend slot while Ball continued as the breakfast show's solo host until 2000.
He went on to work on BBC Radio 5 Live and the BBC World Service. He also appeared on London stations including Jazz FM and Heart 106.2 before taking on the mid-morning show at XFM.
BBC Radio 1 Controller Andy Parfitt also paid tribute to Greening.
Mr Parfitt said: "Kevin was a warm and lovely person, who was widely respected in the radio industry.
"He combined a sharp creative mind with a rare ability to understand the needs of an entire radio station - he was a selfless team member.
"Personally I have much to thank Kevin for, in moments of crisis Kevin would always be there, dependable and mature, anchoring the schedule.
"Kevin worked hard at his craft and enjoyed many successful years at Radio 1 - I respected him enormously."