I know it's non-cannon, But for me, Maul dies three times.
Obi-wan cuts him in half. he falls.
He rebuilds himself ( visionairies comic) and goes after Old ben. Owen Lars shoots him in the face, killing him.
Insane zabrak scienties rebuilds his bran, and puts him in a jar, attached to a holographic projector. The incantation of maul is completely insane (Star wars Tales # 17 ) This is investigated during By Luke, who shuts the machine down, letting maul die for good.
Then there was the clone killed by Vader, vut it was a clone, not the real deal, so it dosn't really count
Like i said, they're non-cannon, but I like those versions.