Almost a decade before he was charged with kidnapping, raping and torturing three women in his Cleveland home, Ariel Castro was himself the accuser in a sexual assault case involving his daughters, NBC News reported. The molestation accusations led to the conviction of his ex-wife’s second husband, Fernando Colon. The case against Colon raises questions about whether FBI agents missed an opportunity to question Castro about the disappearance of two of the women in the months after they went missing. Castro made the accusations against Colon in July 2004, shortly after 14-year-old Georgina “Gina” DeJesus vanished on her way home from school. Colon says he told two FBI agents nine years ago to investigate Castro in connection with the disappearances of Amanda Berry and DeJesus — both friends of Castro's daughters — but the agents seemed uninterested in his tip. Colon said he believed Castro's daughters went along with his molestation accusations because their father promised them lavish gifts. Now that Castro is in custody Colon sees an opportunity to challenge his conviction.