"Tom's insight, talent, strength of character and comic timing made him a vital central figure in the Happy Days experience," says Howard, who played Richie Cunningham on the sitcom.
"A great father and husband, and a wonderful artist, Tom led by example, and made us all laugh while he was doing it," Howard adds. "My last conversations with Tom reflected the love of life and peace of mind that he always maintained throughout his full and rewarding life."
Added Howard, 56, "I miss him already."
The prolific Bosley, known for his work on both stage and screen, died Tuesday in his Palm Springs, Calif., home. On Oct. 1 he had turned 83.