On Monday night's much-anticipated wedding episode of Castle, Castle and Beckett investigate the apparent suicide of a naked man. But wait, there are bloody fingernail scratches down his back. As Beckett observes, this vic must have done the deed before taking the dive! Original Air Date: Castle Season 4, Episode 11: "Till Death Do Us Part" airs on Monday, January 9, 2012 at 10 p.m. ET on ABC.