DKos' Jed defines a "Deather":
Main entry: deather
Etymology: From birther, a related conspiracy theory which holds that President Obama is not a natural born U.S. citizen. Inspired by the teabaggers of April 15, 2009.
Definition: One who believes or spreads the false conspiracy theory that the health care reform legislation before Congress would create "death panels" or force seniors and sick people into euthanasia.
Examples: Sarah Palin is a deather. Glenn Beck is a deather. Rush Limbaugh is a deather.