A man has been arrested following the death of radio presenter Kevin Greening, Scotland Yard has said.
Greening was working at Smooth Radio and BBC7 before his death
The man, in his 50s, was held at the address in Wandsworth, south London, where Greening's body was found.
He has been questioned on suspicion of possessing and intending to supply Class A drugs, and has been bailed until March.
Greening, an ex-BBC Radio 1 breakfast show DJ, died in his sleep on Saturday at the age of 44.
A post-mortem examination failed to establish the cause of his death and further tests will now be conducted, the Metropolitan Police added.
The case is being treated as an "unexplained" death and detectives from the force's specialist crime directorate are involved in trying to establish what happened.
This unit investigates London's "most serious and high-profile cases" and is sometimes described as the "Murder Squad" by the media.
However, a Scotland Yard spokesman insisted this was not currently a murder inquiry.
Police said that officers had gone to "a residential address in Wandsworth" just before 2100 GMT on Saturday, following a call from the London Ambulance Service stating that a man in his 40s had died.
Formal identification has yet to take place and an inquest will be opened "in due course".
Greening co-hosted Radio 1's breakfast show from 1997 to 1998 with Zoe Ball and was also heard in a variety of other slots during his six years at the station.
Until his death he had been the afternoon presenter on Smooth Radio in London and a continuity announcer on digital network BBC7.
He had also been heard in recent years on the BBC World Service and on London stations including Heart 106.2 and XFM.
The BBC News website has received scores of tributes from fans, and a spokeswoman for Smooth Radio said a selection of these would be passed on to Greening's family.
Senior broadcasters such as Simon Mayo - another former Radio 1 breakfast presenter - have also hailed Greening's professionalism and creative skills.
Mayo said he was "a fantastic example" of a broadcaster and "naturally gifted".
BBC Radio 1 controller Andy Parfitt said he had "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, creating some great radio and enjoyed many successful years at Radio 1. I respected him enormously," Mr Parfitt added.
And Mark Goodier - a colleague of Greening's at Radio 1 and Smooth Radio - described how the DJ would "find a way to approach a subject that nobody else would".
"I know this was appreciated by the listeners," Goodier told BBC Radio 5 Live.
"It probably went over the heads of some... but there are many millions of people who really did appreciate the kind of super-intelligence he brought to music radio."