Paul Allen, a co-founder of Microsoft has died at 65 from complications of non-Hodgkin’s lymphoma, a cancer that starts in white blood cells called lymphocytes, which are part of the body’s immune system.

His family made the obituary announcement in a statement on Monday through his sister Jody Allen.

“My brother was a remarkable individual on every level. While most knew Paul Allen as a technologist and philanthropist, for us he was a much loved brother and uncle, and an exceptional friend.

“Paul’s family and friends were blessed to experience his wit, warmth, his generosity and deep concern. For all the demands on his schedule, there was always time for family and friends. At this time of loss and grief for us – and so many others – we are profoundly grateful for the care and concern he demonstrated every day.”

Allen was also owner of the NFL’s Seattle Seahawks and NBA’s Portland Trail Blazers

He announced on October 1st that the cancer he had defeated in 2009 had returned.

“I’ve begun treatment & my doctors are optimistic that I will see a good result,” Allen posted on Twitter. “Appreciate the support I’ve received & count on it as I fight this challenge.”