Cathriona White, the 28-year-old Irish makeup artist whom TMZ refers to as Jim Carrey's "on-again/off-again" girlfriend, was found dead of an apparent suicide Monday night. Two friends found her after going to check on her, the gossip site reports, and law enforcement sources believe she overdosed on pills. Carrey, 53, first met White in 2012 and they dated for a few months. They got back together in May, but broke up on Thursday, and TMZ's sources say White's suicide note was addressed to Carrey and referenced the breakup. (Carrey's last tweet mentions White, and White's final tweet sounds downtrodden—click to see them.)