Media
Rex Features
Greening, who hosted the station's breakfast show with Zoe Ball between 1997 and 1998, died in his sleep on Saturday, aged 44.
Metropolitan Police are treating the death as "unexplained" after a post-mortem examination failed to establish a cause.
A man in his 50s was arrested at the address in Wandsworth, South London, where Greening's body was found. He was questioned on suspicion of possessing and intending to supply Class A drugs, and bailed until March.
Greening worked more recently at BBC Radio 5 Live and on the afternoon show at London's Smooth Radio.
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