Yodakenobi

Yodakenobi was a Jedi master, who lived for over four thousand years by consuming midichlorians and using them to sustain himself through the force, using an ancient technique called Force Consume TM. His only son was known as Blu'ruehh, but he chose to be known as Snoke after he felt betrayed by his father. Yodakenobi died in 14BBY when he hit his head on a treebranch and the resulting wound got infected. The infection was caused by an evolved version of the E-Coli bacteria, which was able to drain all of his midichlorians, and thus robbing him of his life essence. As a result he was not able to reappear as a force ghost.