Rock star Pete Doherty has been arrested on suspicion of supplying drugs following the death of heiress Robin Whitehead, sources have said.
The Babyshambles star, 31, was one of four people questioned following the death of the 27-year-old filmmaker.
The body of Miss Whitehead, granddaughter of the late Teddy Goldsmith, founder of The Ecologist magazine, was discovered at a flat in Hackney, east London, on January 24 after paramedics answered a 999 call.
She died from a suspected drug overdose.
Doherty was arrested in connection with the inquiry on Friday.
A spokesman for the Metropolitan Police said: "A 31-year-old man was arrested on March 19 on suspicion of supplying controlled drugs. He was bailed to return on a date in April pending further inquiries."
Two other men, aged 41 and 28, were arrested on suspicion of supplying a controlled drug.
The 41-year-old man, along with a 53-year-old woman, was also questioned on suspicion of attempting to pervert the course of justice.
The woman is suspected of allowing her premises to be used for the supply of controlled drugs.
Doherty, a friend of Miss Whitehead, said he was "shocked and saddened" following her death.