As a Cardinal fan I will bring up the cases of John Fulgham, Bill DeLancey and Austin McHenry.
Fulgham pitched 2 seasons for the Cardinals in 1979 and 1980.
In those 2 seasons he went 14 and 12 in 233 innings with a WHIP of 1.06 and ERA of 2.84 with 3 shutouts.
He was only 24 when he pitched his last game, and a torn rotator cuff did him in.
I am sure he will be the last pitcher to have career totals of complete games equal to or higher than his career wins, as he had 14 wins and 14 CG.
Bill DeLancey, who Branch Rickey said was one of the 3 greatest catchers of all time, died at age 35. At age 22 he was the catcher on the 1934 WS champs. Tuberculosis and lung issues would end his career at age 23, and he would die at age 35.
Austin McHenry played for the Cardinals from 1918-22. He was well on his way to a Hall of Fame career, when he died at age 27 from a brain tumor.
https://sabr.org/bioproj/person/john-fulgham/
https://sabr.org/bioproj/person/bill-delancey/
https://sabr.org/bioproj/person/austin-mchenry/