Zmierzch (S10E09)

When a fiftysomething wife and mother is found beaten to death in a hospital, Detectives Briscoe (Jerry Orbach) and Green (Jesse L. Martin) search for an elusive silver-haired gigolo (guest star Mark Pinter) who romances a string of rich elderly women and receives expensive gifts – including the victim's heirloom jewelry. But the investigation takes a startling turn when prosecutors McCoy (Sam Waterston) and Carmichael (Angie Harmon) begin interviewing potential witnesses, including the victim's contentious son (guest star Bradley White), daughter (guest star Missy Yager) and Alzheimer's-afflicted husband (guest star George Martin). (iTunes)