Convicted bomber and forger Mark W. Hofmann continued to slowly improve Saturday night in University Hospital following an apparent drug overdose.

Hofmann, 31, is coming out of his coma and is now breathing on his own, according to a nursing supervisor. He was in serious but stable condition.The convicted murderer is serving a life sentence for the 1985 bombing deaths of two Salt Lake residents, whom he killed to cover up elaborate forgeries of historical documents, many of which were sold to The Church of Jesus Christ of Latter-day Saints.

Hofmann was found comatose in his cell in the Utah State Prison at 12:40 p.m. Thursday, and was flown to University Hospital. Blood tests showed he had taken dangerously high levels of an anti-depressant, according to a hospital spokesman.