Hatch's manager, Michael Kaliski, said the cause was pancreatic cancer.
Hatch started his career in off-Broadway theater, and then landing the role of Philip Brent in ABC daytime soap opera All My Children.
He continued to work steadily in television, appearing in such series as The Streets of San Francisco, The Waltons, The Love Boat and Baywatch.
His other soap opera roles included Stephen Slade in NBC's Santa Barbara, and Dean Caldwell in ABC's Dynasty.
He was best known to most for playing the fighter squadron leader Capt. Apollo in the original “Battlestar Galactica” TV series, which aired on ABC in 1978-79. He later appeared in a reprise of the show in the 2000s.
Richard Lawrence Hatch was born in Santa Monica, Calif., on May 21, 1945. His marriage to Jo Marie Hatch ended in divorce. Survivors include a son and a brother.
In 2015, Hatch won an Indie Series Award for his work in Pairings. Watch his acceptance speech below.