I've spent years looking for this 'end of the world' movie...

Hi, can anyone please help me name a movie that I saw? The memorable parts were our hero was a regularly guy who occasionally channeled an alien DJ.
The world came to an end as some virus spread from some leak in a lab. The end was a large look at the earth as the 'dead white zone (engulfed our peacefully waiting hero) spread across, sterilizing the planet.
Can anyone help me?