User blog:KhanWiz/Casey and Steven

Billy killed them because Stu was at Tatum's all night. Billy came to Sidney's after he killed them. People think it was both Billy and Stu because of how Ghostface got from Casey in the Kitchen and through to the Patio doors in a split second. Before you use this as evidence please note that Casey stopped to look at a disemboweled Steve giving Billy time to run around.

So, who do you think killed the couple?