According to his son Nathan Furst's report to CNN, the actor died of complications from diabetes.
According to the family and friends close to Stephen Furst, he was suffering from diabetes and his condition was getting worst than before.
His son Nathan said
"Over the last several years it was getting worse a little bit. Sort of the typical things that tend to happen when you have diabetes a long time."
Stephen started his acting career with the TV show "St. Elsewhere" and "Babylon 5," but he got his big break from his role as the innocent freshman Kent Dorfman in "National Lampoon's Animal House," which ushered in a brand of raunchy comedy.
After his demise, CNN's Washington correspondent shared his condolence via twitter as
RIP Stephen Furst pic.twitter.com/8Mp4sOs6r4
— Jake Tapper (@jaketapper) June 18, 2017
He was seriously in trouble with obesity and diabetes and was fight it since a long time. After he was diagnosed with diabetes in 1986, he dropped more than 85 pounds of weight and also appeared in educational videos on Diabetes.