Audio problem: At Jessica's stockbroker's office, there's a thick rug on the floor, but some footsteps sound as if they were on hardwood.
Audio problem: When singing "Goodbye little yellow bird" Emma blows a kiss to Oliver offstage, but she is still singing the song when she is blowing the kiss. Although it's possible she was pretending as it was part of the act, her voice wasn't even muffled by her hand.
Audio problem: Throughout the episode, the footsteps on the rug-covered floors sound as if they were on hardwood.
Audio problem: The cabin floor is carpeted, but the footsteps heard are of a hard tiled floor.
Audio problem: Several times during the episode, when someone is walking on a rug, the sound of footsteps is that of a hard tiled floor.
Audio problem: When Buck walks to the bar downstairs and meets Mrs. Oates, the sound of their footsteps is that of tiled floor, but they're walking on a rug.
Something Borrowed, Someone Blue - S5-E9
Audio problem: Whenever someone is walking on a rug the sound we hear is of footsteps on a tiled floor.
Answer: In a flashback scene, it was shown that he had a violent temper, so it stands to reason that he finally killed her in a fit of rage.