The Morris County case of a teen killed forty years ago remains unsolved, and the victim’s family members gathered Saturday to plead with the public for help in the investigation. “It’s still time to do the right thing, and any information whatsoever is not too small,” said Mark Thomas, the brother of Christopher Thomas, who was shot and killed at a mall in Rockaway Township. “After 40 years, Chris deserves to rest in peace, my family deserves some resolution, and that is really what we are looking for.” The Morris County Prosecutor’s Office said Christopher Thomas was outside the Rockaway Tow…