cancelled on christmas day. thousands of travelers were left stranded at airports. almost 200,000 new covid cases were reported in the u.s. on christmas eve. a tsa security officer at newark international leapt over a conveyor belt to save a 2-month-old child who stopped breathing. the officer performed the infant version of the heimlich maneuver and was able to get the boy breathing again. now back to dateline. welcome back to dateline. i m craig melvin. all staff target john diamond was arrested for admitting that he had brought an unrej stormrangered gun on to a military base, the same type of weapon used in the fatal shooting of his lover s husband. he was not investigators prime suspect but they needed more evidence. continuing with our steph, here is keith morrison.