A man struck his wife in the head with a hammer at least 10 times and stabbed her before starting a fire in his South Fayette home this morning in what police said was an attempt to conceal evidence of the killing. Robert Abrams, 40, was charged with homicide, arson and abuse of a corpse in the death of his wife, Jeannette, 44. The two quarreled, in part because Mr. Abrams had stayed up late to watch the Penguins' game, which went into three overtimes, before he killed her, Allegheny County Police Superintendent Charles Moffatt said.