I remember him from his Babylon 5 days playing fan favorite Zack Allen. I always liked the way he played that character on that show. His character had a past with drug abuse and the B5 crew gave him a second chance to set his life right on the right track.
In real life, it was only much later did I realize how intense of a drug user Conaway really was. Celebrity Rehab with Dr. Drew really showed how mean and downright damaged he turned out to be after being dependent on the drugs. It seems after trying to get help through normal methods, he got talked into seeking treatment through Scientology, and that didn't help either. I personally think he was wasting his time with the damn space church.
Anyway, he will be missed.