Bobby “The Brain” Heenan, one of the most well known managers and commentators in professional wrestling, has died at the age of 73.

TMZ and ESPN were among the first to report the news. An official cause of death is unknown, but Heenan had been battling throat cancer for the last 15 years.

Heenan got his start in the World Wresling Association. He was eventally signed by the WWE in 1984 and was inducted into the WWE Hall of Fame in 2004.

During his career, hn managed some of wrestling’s biggest superstars, including Andre the Giant, Ric Flair, Arn Anderson, and Mr. Perfect. Many of those stars took to Twitter to honor his memory.