Kimbrough returned from military service .
Kimbrough played for the Los Angeles Dons of the All - America Football Conference ; unfortunately , his second run at a professional football career was cut short by a series of heart attacks that started when he was only 30 years old .
Returning from military service , Kimbrough played for the Los Angeles Dons of the All - America Football Conference ; unfortunately , his second run at a professional football career was cut short by a series of heart attacks that started when he was only 30 years old .