Murder in the Afternoon - S2-E3
Visible crew/equipment: When Jessica and the Lt. leave for the police station, filming lights, equipment, and a crew member are reflected in the windows.
Visible crew/equipment: When Trish picks up Jessica at the train station and her car leaves, filming equipment and crew members are reflected in the windows.
Visible crew/equipment: When Henry and Jessica are reading the resignation letter, state lights are reflected on their glasses.
Visible crew/equipment: When Harry and Amos analyse the bathroom, the edge of the set wall is visible on the right side of the screen.
One Good Bid Deserves a Murder - S2-E17
Visible crew/equipment: When Dr. Dunn is in Jessica's room, the boom mic is reflected in the mirror. (00:27:12)
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.