He played for the Baylor Bears, staying four years; in 1994–95 he led the NCAA Division I in assists, averaging 10.1 per game.
[3] He then served two years as an assistant coach at North Shore Senior High School in his hometown of Houston before moving to Pittsburg, Kansas where he was hired as a graduate assistant for the Pittsburg State Gorillas, joining head coach Gene Iba.
[3] In 2009 Haggerty entered the Midwestern State staff as an assistant to head coach Grant McCasland.
[2] The following season he had a 22–9 record, reaching the conference tournament finals and advancing to the South Central regional semifinals.
[4] In 2019 Haggerty left the head coach position at Midwestern State after eight seasons, and joined Grant McCasland's staff at North Texas as an assistant.
[2] Haggerty died in a car accident on April 16, 2021, less than a month after the Mean Green played in the NCAA tournament.