Billionaire Microsoft co-founder Paul Allen died in agony from septic shock, a report has revealed.

The painful condition was brought on as a result of his long-time battle with non-Hodgkins lymphoma.

The 65-year-old died Monday in Seattle , just weeks after announcing the return of his cancer for a third time, which had been in remission for nearly a decade.

Valued at £15 billion ($20 billion), the mogul’s death certificate highlights the final moments of his life were spent in severe pain.

Allen made is fortune after co-founding Microsoft with Bill Gates (right) in 1975

Paul Allen: Billionaire Microsoft co-founder confirms non-Hodgkins lymphoma has returned

Septic shock is caused when chemicals naturally produced in the body to fight infections fail and seep into the bloodstream, causing severe inflammation and excruciating pain in the muscles.

Allen, who also owns American football team the Seattle Seahawks and basketball team the Portland Trail Blazers, made fortune after co-founding Microsoft with Bill Gates in 1975.

Since then, he invested in technology and media companies, real estate holdings, in addition to building a portfolio of professional sports teams.

Allen was believed to be interested in buying Chelsea FC, just before announcing the return of his cancer

“I met Paul Allen when I was in 7th grade, and it changed my life”, Bill Gates said in an emotional tribute in the Wall Street Journal .

“Paul deserved more time in life. He would have made the most of it. I will miss him tremendously.”

Allen, believed to be the 46th richest person in the world, had revealed his cancer had returned in an emotional announcement earlier this month.

Bill Gates said he will miss Allen “tremendously”

A post on the tech tycoon’s blog said: “I learned recently that the non-Hodgkin’s lymphoma that I was treated for in 2009 has returned. My team of doctors has begun treatment of the disease and I plan on fighting this aggressively.

Paul Allen and Bill Gates in 1981

“A lot has happened in medicine since I overcame this disease in 2009. My doctors are optimistic that I will see good results from the latest therapies, as am I.”

Just days before he announced his non-Hodgkins lymphoma had returned, it was reported he was considering buying Chelsea Football Club from Roman Abramovich.

Allen was never married and had no children.

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