"Kevin died due to ongoing complications from past stomach surgeries and digestive issues," said a statement posted Sunday on kevinsharp.com.
Sharp, a California native, recorded several hit singles in mid-1990s, including his version of the song "Nobody Knows," which held the top spot on Billboard's Hot Country Single & Track for four weeks.
His debut solo album, "Measure of a Man," was released in November 1996 and hit the top-20 country charts, according to AllMusic.com. A second album, "Love Is," followed in 1998.
Sharp was diagnosed in high school with a rare form of bone cancer that had spread to his lungs, according to his website, and he became involved in the Make-A-Wish Foundation, a non-profit that seeks to provide wish-fulfillment experiences to children with life-threatening illnesses.
Sharp's cancer went into remission in 1991, and he launched his musical career while staying active in Make-A-Wish, becoming a national spokesman for the organization, according to his website. He also became a motivational speaker.
A memorial service for Sharp was being planned in Nashville, the website statement said.