Corey Haim's agent says he has doubts the actor died from a drug overdose.

The 38-year-old former 1980s child star died after he collapsed at his mother's home in Los Angeles.

Agent Mark Heaslip says Haim had been doing well battling his drug problem.

Los Angeles police have put the death down to an overdose, but the coroner is waiting until toxicology tests come back before confirming the reason for his death.