Jill Biden’s ex-husband was arrested Monday on charges he murdered his wife in Delaware in December, according to a report. William Stevenson – who was previously married to the former first lady – has been hit with first-degree murder charges for allegedly killing his current spouse, Linda Stevenson, 64 at their home, Fox 29 reported. Cops responded to a domestic dispute call on Dec. 28 and found Linda unresponsive on the floor. She was declared dead at the scene but the cause hasn’t been released yet. The 77-year-old husband – who owns college bar The Stone Balloon near the University...