He had a wild party, his house got absolutely trashed and things were broken, among them his phone and security system. He hired cleaners to pick the place up like any young, rich man would do. He then finds out that a friend who was at the party was discovered murdered, and out of paranoia, refuses to talk to the police without a lawyer.
That scenario is very unlikely. Chances are he pulled the trigger, witnessed the trigger pull or is covering up for a buddy after the fact.