Who was the first dinosaur to die?

THE ONES STANDING CLOSE TO CHICXULUB IN THE YUCATAN WHEN THE COMET/METEOR STRUCK. THEY WERE VAPORIZED. AFTER THAT THINGS GOT DARK AND DEADLY, AND VERY CONFUSING. STARVATION, FIRE, THEN FREEZING COLD (NO SUN)

SO A GOOD ANSWER -- THE FIRST DINOSAURS TO DIE WERE THE LUCKY ONES.