Although there is no indication of foul play, the New Hampshire medical examiner's office is investigating the death of former Boston frontman Brad Delp, who died over the weekend.

Brad Delp

The singer, best known for singing classic rock radio hits like "More Than a Feeling" and "Don't Look Back," died alone at his New Hampshire home Friday at the age of 55, according to local police. Foul play is not suspected, but toxicology reports are being conducted.

Delp's powerful, high-register singing was an integral part of Boston's ascent to rock superstardom in the mid- and late-1970s. The group's self-titled 1976 album is often credited as the top-selling debut in US history with 17 million copies; the 1978 follow-up, Don't Look Back, shifted 4 million in its first month of release.

In a statement posted on the band's Web site, Boston guitarist, keyboardist, songwriter, and producer Tom Scholz said, "We've just lost the nicest guy in rock and roll."

Boston went long periods without issuing new material, and Delp left the band in 1991 to pursue music with former Boston member Barry Goudreau.

In recent years, Delp fronted Beatle Juice, a Beatles cover band that had a substantial following in New England.