A 25-year-old Baltimore County man has been charged in the fatal stabbing of his ex-girlfriend's boyfriend Saturday, Baltimore police said. About 6:45 p.m. Saturday, police found 24-year-old Damien Osacoca lying in a pile of snow in the 4000 block of Massachusetts Ave. in Southwest Baltimore, bleeding from his head and torso. Police said Charles Kerins of the 1100 block of Ingleside Ave. was picking up his 4-year-old daughter from his ex-girlfriend's home and got into a fight with Osacoca, her current boyfriend. Kerins and a woman later appeared at the Southwest District police station to report he had been involved in a stabbing, police said, and he was transported to Maryland Shock Trauma Center, where he was treated and released. After an investigation, Kerins was charged with first-degree murder and was ordered held without bail.