“A Stitch in Crime” features Leonard Nimoy as Dr. Barry Mayfield, who commits two murders and purposefully botches a heart operation, all to get some revolutionary surgical technique out to the world before someone else does. Columbo has to work past his fear of hospitals and people’s open guts in order to figure out how to trap the doc in the act. Zack Handlen (AV Club) is on the show for some deep analysis and to help Jon and RJ figure out what kind of murderers they look like.