I have just discovered that Light Yagami did not die because Ryuuk wrote his name in the Death Note, but because he committed suicide! Here is the news article from the future (written by L). *Potash Mounty is a made up food*

MASS MURDERER COMMITS SUICIDE
Light Yagami, Japanese mass murderer (also known as Kira), committed suicide yesterday, December 28th 2010. at 2:33. His body was found in an abandoned warehouse at a wharf in New York. There was newsprint pulp splattered around the warehouse. A container of Potash Mounty was clutched in Yagami's hand. Investigators believe that he poisoned himself. They believe that, while he died, he threw newsprint pulp around the warehouse. This was probably a diversion so that people would believe he committed suicide, but he died before he could leave the wharf.