Murder Without Conviction (TV)
(2004)

Dr. G.K. Sanderson (Lawrence Pressman) murdered Alberta Talley (Laura Kirk) so he could continue using her savant twins, James Talley & Edward Talley (David Proval) in pioneering psychology expirements. He kept both twins seperated, so they couldn't remmber the homicide. Cornered at gunpoint by the cops he OD'S on a lethal dose of morphine.

Thanks ND Woods!