Two for the Show - S5.E6

A man slaughters his wife who he believes is having an affair. He drags her body and puts it in the bathtub. The police arrive and he refuses to let them near the bathtub. He chops up the corpse and hops a train with a trunk containing his wife's corpse. The detective follows him. The man switches trunks but when he opens the other one he gets a big surprise.