 After the Adolescents' first break-up in 1981, Casey went on to form his own band D.I., where he performed as a lead vocalist for the first time.When the Adolescents reformed in 1986, Casey returned to the band but left before the 1987 reunion album "Brats in Battalions" was recorded.He rejoined them again in 2001–2002 for their 20th Anniversary Tour.