Man sinks into mud- then dies?

A man chased into an open field on foot by sheriff's deputies early Tuesday sank into a quagmire (a soft wet area of low-lying land that sinks underfoot) and died after deputies were unable to rescue him.

County sheriff's Sgt. Don Peritz says deputies had stopped the man in his vehicle for having an outdated registration sticker. They say the man fled into a nearby field after deputies learned he'd identified himself falsely.

According to the spokesman, deputies searched for about an hour before they found the man sunk up to his waist in a quagmire. They tried repeatedly over several hours to pull him out, but they, too, called for help after they began sinking into the cold mud.

The man eventually died before he could be removed.

Peritz says it's not known why the man died, and an autopsy is planned, but he says the man, who hasn't been identified, told his would-be rescuers that he had a medical condition.

Wait- what? He was up to his waist in mud, and then he just died? WTF? How the hell does that happen? I feel like they police aren’t telling us something here… article here.