The Callie Theory

Callie was the only person staying at the house when Kurt died. If he didn't kill him, it seems plausible he could have been in on the murder conspiracy. Detective Grant never met Callie and to this day, Callie refuses to talk about Kurt's death on the record. Dylan Carlson also bought the gun used to end Kurt's life. He claims he never would have purchased the gun if he thought Kurt was suicidal.