Bad murder plan
Spoilers ahead
The second murder feels a bit too clumsy and elaborate to get away with it.
He visits Richard's house drives him around and above all he is already suspect #1. The police just needs to get his cell phone movement (although he could have left it home) or find a cc camera video to place him with Richard on the day he disappeared.
The only good idea is to make it seem like Richard has gone so there is no murder to investigate.