William McTonic, of Jerome, is charged with homicide. He was arrested in nearby Somerset after he was pulled over by police Friday and is in the Somerset County Jail.
Conemaugh Township police chief Pete Barclay said the couple had been married for only a few weeks and were living in different residences.
A daughter of the victim told police her mother had begun to end the relationship. Authorities say McTonic became upset, threatened the woman and her family, and also threatened suicide.
Henderson-McTonic's neighbors heard what they believed were gunshots Thursday night, but thought the noises were coming from a nearby target-shooting club, police said.
Police said McTonic told them a gun case on the back seat of his car contained a rifle and a revolver he had been shooting. Police said the case also contained a .22-caliber gun, and authorities later found another gun of the same type and shells in his home.
It was unclear whether McTonic has an attorney. A telephone message left at McTonic's home wasn't immediately returned Sunday.
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