The plunging polar vortex is bringing subfreezing temperatures to some of the southernmost points of the U.S. A forming storm system is threatening to dump snow on parts of Texas and Oklahoma, while communities in Louisiana and Florida may see frigid cold.

New York City’s police commissioner says the gun found on the suspect in the killing of UnitedHealthcare’s CEO matches shell casings found at the crime scene.

The suspect in the killing of UnitedHealthcare’s CEO struggled with deputies and shouted while arriving for a court appearance in Pennsylvania a day after he was arrested at a McDonald’s and charged with murder.