Leah Coleman was a mentally-disturbed woman who killed her daughter Rachel. She at first lied a fictitious Puerto Rican man kidnapped her daughter, but when alone with Curtis, a religious man himself, she implied she smothered her daughter and then burned her remains in an amateur cremation.
Leah tried to argue she was mentally incompetent at the trial, depressed from believing Rachel was protected from a dangerous world Leah didn't want to chance raising her in. In the end, she admitted on the stand she knew what she was doing and was convicted and imprisoned for Rachel's murder. (L&O: "Angel")