Charles Siebert, who famously played the role of Dr. Stanley Riverside II on "Trapper John, M.D," has died. He was 84.

Siebert's daughter, Gillian Bozanic, first confirmed the saddening news to The Hollywood Reporter. She revealed that her father died on May 1 at the University of California San Francisco Medical Center.

She added that Charles Siebert's cause of death was due to COVID-related pneumonia.

The official website of 6th Street Playhouse in Santa Rosa, California, also shared it on its website and paid tribute to the actor.

"Charlie will be greatly missed, but forever celebrated by Playhouse patrons and the artists who were fortunate enough to be in his presence. He was certainly the most distinguished actor to ever grace the boards of 6th Street Playhouse," it said.

His family is yet to reveal the details about his wake and funeral, but fans from all over the globe have since sent their message of condolences to the actor's bereaved loved ones.

Charles Siebert's Legacy Explored

Siebert first made his Broadway debut in 1967, "Galileo." Brecht's production opened the doors to the Broadway stage five more times thereafter.

He also began his TV career in the late 1960s, appearing in the soap opera "Search for Tomorrow." During the 1970s, Siebert continued to make appearances in "The Rockford Files," "Kojak," "Police Woman," "Another World," "The Adams Chronicles," and "Hawk," to name a few.

He famously landed a recurring role in the soap parody, "Mary Hartman, Mary Hartman" before making guest appearances in "One Day at a Time," "Good Times," and "All in the Family."

In 1979, Siebert finally reached his breakthrough in the "M*A*S*H" spin-off, "Trapper John, M.D." He played the role of Dr. Stanley Riverside II, the opposite character of the ones played by Pernell Roberts and Gregory Harrison.

While enjoying his time in the series, the actor also started his directing career, helming hit flicks like "Hercules: The Legendary Journeys," "Xena: Warrior Princess," "Pacific Blue," "Knots Landing," The Pretender," and "Silk Stalkings."

Siebert then continued his stage career at the 6th Street Playhouse in Santa Rosa, California, and became part of "Death of a Saleman," "Cat On A Hot Tin Roof," and "A Christmas Carol."

He was survived by his wife, Kristine Leroux Siebert, and his children and stepchildren.