Castillo appeared on numerous tours alongside Ozzy, and played on such hit albums as 1986's The Ultimate Sin, 1989's No Rest for the Wicked, 1990's Just Say Ozzy, 1991's No More Tears, and 1993's Live and Loud. After leaving Ozzy's band in the mid-‘90s, Castillo laid low for a period, but lent his drumming skills to other artists' recordings, including the soundtrack to Poison singer Bret Michaels' 1998 movie, Letter from Death Row, as well as a 1997 self-titled release by guitarist Terry Ilous' all-star project, Cage. During the spring of 1999, Castillo received a phone call out of the blue from Ozzy's manager/wife, Sharon Osbourne, recommending that the drummer get in contact with Mötley Crüe, regarding their vacated drum position. Castillo's talent and résumé spoke for themselves, as he landed the gig without a tryout, and debuted with the group on their 2000 release, New Tattoo. But shortly thereafter, Castillo was diagnosed with a form of cancer called Squamous Cell Carcinoma. He took a leave of absence from the Crüe to undergo treatment, and by the summer of 2001, appeared to be well on his way to a full recovery. Sadly, the cancer returned, and Castillo passed away on March 26, 2002, at the age of 51. In addition to his aforementioned recordings, he appeared on variety of tribute albums for other rock acts during the late ‘90s, including Alice Cooper (Humanary Stew), Aerosmith (Not the Same Old Song and Dance), Def Leppard (Leppardmania), and Guns N' Roses (Rock Tribute to Guns N' Roses), among others. ~ Greg Prato, Rovi