Worth is scheduled to be arraigned Monday morning. His attorney, Michael O'Rourke, said he will plead not guilty and seek reduced bail.
The criminal complaint accuses Mueller of strangling his girlfriend and burning her body in a barrel on Worth's property. It says Worth helped him dispose of the ashes in a frozen lake.
Worth is charged with assisting a felon and helping mutilate a corpse. The charges carry a maximum penalty of 16 years in prison and a $35,000 fine.
Mueller's mother is also accused of being an accessory.