Pete Doherty was one of four people questioned on Friday in an ongoing investigation after the death of Robin Whitehead, who died of an overdose in January. She was filming a documentary about Pete when she died, and was the granddaughter of the founder of The Ecologist magazine.
Pete was arrested on suspicion of supplying drugs after paraphernalia was found in her apartment when she died. He has been bailed and will return in April. Two other men were also arrested on suspicion of supplying drugs, and a woman was arrested on suspicion of attempting to pervert the course of justice.
Earlier this month Pete was banned from driving after an accident in September.