Morgan Norwood reports on the violent tornadoes from a multi-day severe weather outbreak that are again threatening millions after a terrifying 24 hours in the Heartland, as raging wildfires burn across the South; more than a week after two University of South Florida doctoral students were last seen, Victor Oquendo has details on Tampa police discovering the remains of one student, whose roommate has now been arrested in connection with the disappearances; Alex Stone shares the heartbreaking tribute from Jake Reiner, the son of Rob and Michele Reiner, to his parents – describing the grief from their murders as a “living nightmare;” and more on tonight’s broadcast of World News Tonight with David Muir. 00:00 Intro 02:35 Violent tornadoes unleash devastation across the Heartland as wildfires burn in the South 06:13 U.S. soldier faces judge after allegedly profiting $400,000 from Maduro bet 08:10 U.S. and Iranian negotiators head to Pakistan, but unclear if they'll meet 10:46 Roommate...