Future Vegeta Character Facts

Future Vegeta is the alternate timeline counterpart of Vegeta.
Future Vegeta's life was exactly the same as his main timeline counterpart's life until August of Age 764 when Future Goku used the Instant Transmission to arrive on Earth and kill Future Frieza and Future King Cold. Sometime afterward, Vegeta trained and became a Super Saiyan. 
Six months later on May 12th, Age 767, the Androids attack and Future Vegeta is the second Z Fighter to be killed by them. In the TV special, Vegeta is shown receiving a hard kick to the stomach by Future Android 17, and in the episode "Ghosts from Tomorrow" it is shown during a flashback that he dies after being struck by 17's Photon Flash while stuck in the ground after receiving a brutal attack. In both instances, he retains his Super Saiyan power and abilities.
Like his alternate counterpart, sometime after the battle with Future King Cold and Future Frieza, Future Vegeta manages to transform into a Super Saiyan after undergoing various training.