Pittsburgh police say a man who escaped from a halfway house while serving a drunken driving sentence has been charged with fatally stabbing a man outside a bar.

Police say 30-year-old David Umstead is claiming self-defense in the Aug. 29 death of 58-year-old Delrio Ivy. Police say Umstead claims Ivy tried to rob him during a drug deal and that he stabbed Ivy only after being cut by him.