Future Chiaotzu is the alternate timeline counterpart of Chiaotzu.
Future Chiaotzu is briefly seen in the TV special Dragon Ball Z: The History of Trunks, outside Goku's House with the other Z Fighters, as Future Goku Son dies from the Heart virus.
On May 12th, Age 767, Future Chiaotzu is killed by the androids. Whilst a scene of him being killed is not shown in the anime or TV special, Future Trunks states in both the manga and anime that Chiaotzu did indeed fight against the androids with the other remaining Z Fighters that had been killed alongside them.
Future Chiaotzu was 29 years old when he was killed by the androids.