17 kills Yamcha.

This is the Android 17 from Future Trunks' time. He and his twin sister Future Android 18 killed the Z fighters, then killed Future Gohan which (in the anime only) caused Trunks to transform

Over 21 Years after killing Future Gohan The Androids continue their rampage on Earth Trunks confronts them but he was easily beaten and defeated by 17 and 18 Death 9 years later while 18 was destroying a town an old man shot 17 in the head 17 walks toward him and pulls out a gun to shoot the man but right then Trunks shows up and confronts them for the last time and kills Android 18 with peace for the future and kills Android 17 with Another End