(written from a Production point of view)
He appeared as Theodore Snow on the television series First Monday, co-starring Camille Saviola and Gail Strickland. Markle appeared in Crossing Jordan with Miguel Ferrer, Susan Gibney, Jeffrey Nordling, and Wallace Shawn. He guested on an episode of A Man Called Sloane with Clive Revill. He also appeared in The Edge of Night with Bruce Gray. In an episode of Civil Wars, he guested with Tricia O'Neil and Don Stark. Dey Young guested with Markle in an episode of The Practice. In an episode of Without a Trace, he guested with Daniel Dae Kim. Neal McDonough starred in Medical Investigation, a TV show in which Markle guested. He guested on an episode of The West Wing with Bruce Gray.
He passed away on 6 November 2018 in his North Hollywood home in California. His wife, Deborah Dietrich, revealed that the actor died from complications related to Parkinson's disease.