Sorry if anyone one else has offered this explanation for the suitcases found on Allison & Gerard's bed....I'm wondering if one of them was packing to leave (the marriage)? I'm wondering if this was the catalyst for the final escalation on that terrible night of the 19th. It could have happened either way. Scenario 1: Gerard says that he's had enough & is leaving Allison for Toni. Allison breaks down and begs him not to leave, perhaps even physically holding on to him to stop him from packing his things/leaving, and the argument progresses from there. Or Scenario 2: Allison tells Gerard that she is leaving him & he flies into a rage, knowing that he can't afford a divorce, etc. Either way, it ends in a physical altercation & poor Allison is no match for Gerard physically. Due to the Police arriving so early the next morning, Gerard didn't have time to put away the suitcases. This is just an idea and, of course, it's all purely hypothetical!