He was literally murdered (shot) in his bed by Chicago cops, after a Judas slipped him a drug the night before so that he was drowsy and muddled when they came, breaking down the door. The raid was planned out by the FBI. The then-chief of police, Hanrahan, was correctly identified by the Black community as the chief culprit, and his political aspirations were permanently destroyed as a direct result of this. There's an excellent book about this, The Assassination of Fred Hampton, at https://www.zinnedproject.org/materials/assassination-of-fred-hampton