I did a little investigation on lukeisback and realized that Luke was begging for a ride to AVN long before the infamous Randall New Years Eve party.
http://www.gofuckyourself.com/showthread.php?t=551239

Did Holly catch Luke in some cyber/phone chat with a former Asian-Canadian pornstar and this led to the demise? Maybe he used the M word (NOT marriage, rhymes with Katja) during a passionate lovemaking session and she felt betrayed. Luke portrays Holly as the promiscuous one but perhaps the party was just a big set up to get even with him and his cheating ways.

Sorry to rehash this again.