Agreed with everyone, i really dislike what DC is doing with wally but everything points to King using him as the murderer in this tragic story.
For me, and a lot of people, wally west was THE FLASH...Even the portrait of barry in the films and television is basically the actor's playing wally with a differente name. It's a bad end of the road for him but DC is screwing with the flash mythos by a loooong time.