A clean-cut actor capable of projecting the "aw, shucks" attitude of a young James Stewart, Boyd Gaines first came to prominence as the promising acting student who ends up as a waiter in "Fame" (1980) and a three-year (1981-84) stint as Mark Royer, the dental student who married Barbara Cooper (Valerie Bertinelli) on the long-running CBS sitcom "One Day at a Time." He also made a memorable impression as the youthful coach lusting after a gym teacher in the low-brow hit comedy "Porky's" (1982).