Brad Renfro died from an overdose of heroin that he injected into his body, the LA County coroner concluded.

The coroner determined the death was accidental.

The actor – best-known for starring in 1994's thriller The Client – was found dead January 15 at the age of 25.

Renfro was a past abuser of heroin, cocaine, marijuana and alcohol. He had a stint in rehab and dealt with legal woes.

Before his death, he seemed to have finally turned the corner on his drug problems.

Renfro's roommates let him live with them rent-free to help him stay off drugs and a week before his death he visited his family in Knoxville, Tennessee. "In other years, we had to babysit him," his cousin Jesse Hasek told Us. "This time, he was like, 'I've got it figured out.' It was the happiest I've seen him."

In Knoxville, Renfro glowed about his 4-year-old son, Yamato, who lives in Japan full-time with his mom. (Yamato was "unplanned," Hasek told Us, and his mother is "a friend he had over there.")