maybe it was Justin before he left to go to meet Katie?!
i dont think it was Warren though, cuz he was busy running Justin over, i dont think it was Max as at the end of the show he was seen at his sink washing off something red off his hands.... claire wasn't bleeding from behind when she was pushed, or at least there were no stains on the back of her coat to indicate she was!
Calvin seems to obvious, his phone was left at the scene... maybe it was planted to throw the police off the scene or maybe it really was him and the writers have put his fone there so we may think its too obvious to be Calvin but it actually was???? oooh, and the fact Carmel saw him when they found Clare's body was a bit of a co-incidence.
i dont know about OB... it could have been him.. he was seen running, but i guess being biased to OB cuz i do think he's great, i dont think it was him!!! he and Max have always been full of threats but i dont recall when they have actually acted on any of these threats....
probably wrong, we know what soap world is like.. its probably Tom!!