Antonio Puerta-2007-Spanish soccer player capped at the national level at 22, died of a heart attack on the field.
Jerome Brown-1991-NFL DT, died at 27 in a car accident after two straight Pro Bowls and All Pro seasons from 87-91.
Sean Taylor- NFL Safety, shot by burglars at 27.
Ed Delahanty-Baseball player, fell off Niagra Falls.
Addie Joss- MLB starting pitcher with 1.89 career ERA. Meningitis at 31.
Dražen Petrović- NBA, car accident at 28. Arguably one of the best Euro players ever.
and if car racing counts, Ayrton Senna of course.