Daniel Rakowitz believed he was the second coming of Jesus Christ.  Instead of following his christian belief, he turned to the dark-side and became a brutal murderer and cannibal and even went so far to serve the homeless human flesh without their knowledge!

References:

https://www.villagevoice.com/the-untold-story-of-the-tompkins-square-murder/

https://en.wikipedia.org/wiki/Daniel_Rakowitz