Sheehan, drummer Sib Hashian and guitarist Barry Goudreau were all long-time friends of Delp's who had worked with the singer in various other bands over the previous few years.

Following Goudreau's and Hashian's departure, Sheehan was fired from the band midway through the sessions for Boston's Third Stage album in the early '80s.

After leaving Boston, Sheehan (along with two other ex-band members) sued Tom Scholz, before settling out of court.

Sheehan stopped playing the bass during the 1990s for several years after he injured his arm and hand in a biking accident.

[3] On February 25, 2012, Sheehan played with Boston bandmate Barry Goudreau on stage outdoors for a three-hour benefit concert in Florida at the All Star Jam for the Sydney and Berne Davis Art Center in Fort Myers, Florida.