A familiar face, if not always a name, to audiences from the mid-1960s to 2018, Robert Hogan was a dependable presence in dozens of television series, including the original "Twilight Zone," "Batman," "M*A*S*H," "The Wire," and three series in the "Law & Order" franchise. He played, among other characters, a cop whose son was a murder suspect in the "L&O" Season 4 episode "Kids," a white supremacist on "Reparations" from Season 12 of "SVU," and an array of judges and federal agents, totaling 12 appearances.

In addition to his numerous guest appearances, Hogan also enjoyed recurring roles on several series, including "Peyton Place," "Days of Our Lives," "Alice," and "Murder, She Wrote." He worked less frequently in feature films, though he had an uncredited role in 1973's "Westworld" and supporting turns in "Species II" and "Sweet Land." Hogan, who began his career in off-Broadway theater, returned to the stage in the 1990s and appeared in the original Broadway run of "A Few Good Men," among many other productions. A diagnosis of vascular Alzheimer's disease slowed his career in 2013, but he continued to make occasional appearances on TV until 2018. His prolific TV work was paid tribute in Quentin Tarantino's "Once Upon a Time in Hollywood" when Rick Dalton paid him a compliment while watching his appearance on an episode of "The F.B.I."

Hogan died of complications from pneumonia at the age of 87 in his home in Maine on May 27, 2021.