Donnelly Rhodes, the actor who played Dr. Sherman Cottle on Battlestar Galactica as well as Agent Smith on CW's The Flash and Legends of Tomorrow, has died at the age of 81. According to a news release, given to SYFY WIRE from his talent agency, Northern Exposure, the Canadian native died from cancer at the Baillie House Hospice in Maple Ridge, British Columbia.

Born in Winnipeg, Manitoba, in 1936, Rhodes began his acting career in 1960 with a role on Bonanza. Since then, he starred in movies like Butch Cassidy and the Sundance Kid and television shows such as Mission: Impossible, Taxi, Cheers, and Golden Girls.

His most notable performances, however, were as the chain-smoking, wisecracking Dr. Cottle on Galactica (2005-2009), who, sworn to uphold the duty of the medical profession, does not discriminate between humans and Cylons. Most recently, Rhodes appeared in the DC Universe as Agent Smith ("Invasion!"), a high-ranking NSA employee who tried to kill Green Arrow, the Flash, and the Legends of Tomorrow. Understandably, the president assigned him to Antarctica for insubordinate behavior.

Throughout his career, Rhodes earned a number of distinctions for his acting. They include: 2006 Gemini Earle Grey Award for Lifetime Achievement, 2002 Gemini Award for Best Performance by an Actor in a Continuing Leading Dramatic Role for “Da Vinci’s Inquest," 1999 and 2000 Gemini Award Nomination for Best Performance by a Leading Actor in a Continuing Leading Dramatic Role, and a 2008 UBCP Sam Payne Award for Lifetime Achievement. He was also recognized with a star by the BC Entertainment Hall of Fame on the Granville Street “Star Walk."

Upon Rhodes' passing, the Galactica crew paid homage to him on Twitter:

"It has been an honour to represent Donnelly over the past 2 plus decades. We would like to express our gratitude and thank his family for a lifetime of entertainment that he provided to all of us," said his agent, Lisa King, in an official statement provided to SYFY WIRE. "His daughter, Seana Henry, formerly an agent at Abrams Artists, and her family would like to thank everyone for the outpouring of support and their kind words and thoughts."

He is surived by his wife Sarah, daughter Seana, son Westerley, and brother Tim Henry, "as well as extended family, friends and of course his many fans."