The show creators tried to have their cake and eat it too regarding Michael's death. We learn that his death was faked—he didn't die of a brain tumor, but rather was whisked away by a covert government entity (Poseidon) to serve as a disposable asset in a Yemeni prison.
Here’s a detailed feature addressing the question: is michael scofield in season 5
The show ran for four successful seasons, concluding with a supposed finale in 2009. However, in 2017, a fifth season was released, leaving fans wondering if Michael Scofield would return. The show creators tried to have their cake