Paul Allen died Monday at 65, and now his death certificate has been released.
According to the certificate obtained by TMZ, Allen died at Swedish Medical Center in Seattle from septic shock, immunosuppression and non-Hodgkin’s lymphoma.
Allen had recently announced that he was battling cancer again after a nine-year remission.
The mogul co-founded Microsoft with Bill Gates in 1975, and was owner of the Seattle Seahawks and Portland Trailblazers. He also co-owned the Seattle Sounders.
Allen was worth an estimated $20 billion. He never married and had no children.