After his active boxing career ended, Mike Donovan became the boxing instructor at the New York Athletic Club for 30 years, retiring in Sept. 1914. He taught United States President Teddy Roosevelt and his sons how to box. He was given a pension by the Club and, in appreciation, he donated his title belt and other memorabilia. April 17, 1914 New York Times, p. 9.
It was reported that Donovan was 73-years-old when he died. His will indicated that his last name was actually O'Donovan.
His silver championship belt was bequeathed to his son, Arthur Donovan, who was in the 105th Field Artillery at Spartanburg, North Carolina, at the time. He also had a daughter, Katherine, and another son, Henry.