Larry King’s wife Shawn accused him of sleeping with her own sister, RadarOnline.com is reporting exclusively.
Earlier this year, Shawn became convinced that Larry and her sister Shannon Engemann, 45, were having an affair.
Shawn and Shannon fought bitterly over the situation, sources said.
Shawn and Larry each filed for divorce Wednesday. They have two children.
Shannon had been staying at the Beverly Hills hotel for about a year and a half and Shawn was convinced that Larry was paying the bill.
Shannon, Shawn and Larry have all denied the affair.
But a source close to the family says it is true. And it weakened an already troubled marriage.