The Androids (specifically Android 17) kill Future Vegeta.
Six months after Future Goku's death from a heart virus, on May 12, Age 767, Future Vegeta, fighting as a Super Saiyan, is killed by the Androids 17 and 18 during their initial attack on the Z Fighters. He is the second Z Fighter to fall to the Androids in the alternate timeline depicted in the Dragon Ball Z TV special, The History of Trunks. The special shows Future Android 17 delivering a powerful kick to Future Vegeta's stomach, leading to his demise. At the time of his death, Future Vegeta was 35 years old.