TAINTED BLOOD - Matthew Patrick , Raquel Welch - Full Movie (1993)
A teenage boy with a rare genetic disorder that turns him into a killer goes on a murderous rampage, killing his family, then himself. A best-selling author tries to find the boy's twin sister who was separated at birth from her brother and who may also, at any time, go on an uncontrollable killing
Also starring Joan Van Arc, Allie Mills, Kerri Green and Natasha Wagner.
"This neat little thriller directed by Matthew Patrick makes a valiant effort to conceal the killer's identity and keep the level of interest high as one revelation after another sets the pendulum swinging between suspects."