Huh? Riddle

a detective walked up to a door. before he went inside he heard: NO BOB! DONT! the there was a large BANG! well the detective ran inside the door to find a plumber an electrician and a traveling salesman. there was also a dead woman on the floor with a gun beside her. the detective immediately arrested the traveling salesman. how did he know it was the traveling salesman that killed the woman?

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