“Who Killed Our Father?” (*1/2 out of four) was a slack, derivative suspense thriller about a young woman (Leila Comerford) whose father dies and she then embarks on a journey to discover the sister she never knew she had but doesn’t expect all the realizations and problems this will result in for her. Slickly directed and shot but can’t cover up for a tired screenplay that gets more silly and illogical as it goes along. Does anyone remember when these types of thrillers were actually fun? A few more clunkers like this might actually “kill” the genre for good.