Nebraska football standout Calvin Jones -- who went on to play several seasons in the NFL -- was found dead in his Omaha home this week. He was 54 years old.
According to an incident report, Omaha Police responded to the residence around 8:30 PM on Wednesday ... and upon arrival, discovered Jones' body in the basement.
Officials tell TMZ Sports a gas generator was located inside the home and "signs of carbon monoxide poisoning" were evident .