Patrick's reasons are ridiculous but I think it's more of a case of reading people that told him the shrink was fake. It was hilarious when she climbed out the window!
How frustrating to spend six months planning a con, killing someone only to find that someone got there first and switched the key. Brooke's spent too much time thinking she's smarter than everyone else that she underestimates people, and she underestimated Patrick. It was cute how she got out of the interrogation room by diverting the cop about his uniform.
Not a great episode, neither con wasn't that smart and there were only a few suspects so it wasn't surprising who it was.