(written from a Production point of view)
He is probably best known for his appearances as former mental patient Lloyd Braun on the hit television series Seinfeld. That series featured Star Trek: Voyager guest actor Jason Alexander as a regular cast member.
McCoy starred as Sergeant Nick Lassard in two Police Academy films, both of which also starred Star Trek: Deep Space Nine and Star Trek: Voyager guest actor David Graf. The first was Police Academy 5: Assignment: Miami Beach in 1988, which also featured Rene Auberjonois. That same year, he and Auberjonois co-starred together in an episode of Murder, She Wrote. The following year came Police Academy 6: City Under Siege, which also featured the likes of Kenneth Mars, Arthur Batanides, and Darryl Henriques.
Also in 1989, McCoy had a supporting role in the science fiction film DeepStar Six, along with Miguel Ferrer. In 1992, he played a lead character named Michael Bartel in the Curtis Hanson film The Hand That Rocks the Cradle (with John de Lancie) and cast by Junie Lowry-Johnson. His motion picture credits since then have included Hanson's L.A. Confidential (1997), which co-starred James Cromwell, Bob Clendenin, Steve Rankin, Symba Smith, Brenda Bakke, John Mahon, Jim Metzler, and Colin Mitchell, as well as stuntmen Steven Lambert, Don Pulford and Allan Graf; and the 2003 action comedy National Security which also featured Brett Cullen.
McCoy and his L.A. Confidential co-star James Cromwell were among the many Star Trek veterans who were part of the cast of the 1986 mini-series Dream West. The other Trekkers who had roles in this series were F. Murray Abraham, Jeff Allin, Erich Anderson, John Anderson, Lee Bergere, Michael Ensign, Jonathan Frakes, William Glover, Alice Krige, Glenn Morshower, Fritz Weaver, Noble Willingham, and Anthony Zerbe. McCoy and Cromwell later co-starred in the 1990 television movie Miracle Landing – along with Jeff Allin and Herta Ware – and in 2001, they were both regulars on the short-lived television series Citizen Baines.