Name some boxers with clean, undefeated record that just simply vanished.

[thealfa]

Mike Garcia - 26-0, fought from 1992-1998 - from Chicago

Marek Piotrowski - 21-0, fought from 1992-1996, from Poland

any more did I miss? Makes me wonder what happened? Why they quit? Was there health concerns? These records could have been attractive to HBO or Showtime.