Cynthia Lynn -- the actress who played Helga on "Hogan's Heroes"  is dead, and it's believed she was one of only two surviving members of  the cast.Family members tell TMZ Lynn had been in good health but was  taken to the hospital Friday because her leg was swelling up.  Doctors  told her she had Hepatitis. On Monday night, her organs started shutting  down. She died Monday night.Lynn played Helga -- Klink's secretary --  during season 1, from 1965-66.   "Hogan's Heroes" was one of the most  popular shows of its time, running from1965-1971. We did some checking,  and Robert Clary ... who played Cpl. Louis LeBeau ... appears to be the  final cast regular still living.Lynn also appeared on  "Mission:Impossible," "The Odd Couple" and "The Six Million Dollar  Man."Lynn was 76 years old.  Cause of death is multiple organ failure.