Investigators have yet to offer a motive for Adam Lanza's deadly rampage, but a Newtown resident offers one theory to Fox News: Lanza lost it because his mother planned to commit him against his will. Joshua Flashman, the son of a Newtown pastor, says he has been told that Nancy Lanza was petitioning the court to get conservatorship over her son so she could then send him to a mental institution, and Adam was "really, really angry" about it. "I think this could have been it, what set him off.” Another resident tells Fox a similar story; police say only that Nancy's plans for "his future mental health treatment" are being reviewed in the search for a motive. Other recent revelations: