Chicago-To-Germany Flight Diverted Because Of Unruly Passenger

"The flight attendant just ran up to me and literally grabbed me by the shirt and said, 'You need to come with me now...." They came upon three men wrestling with another passenger who... had been in the restroom for 20 or 30 minutes and wouldn't come out.... They handcuffed the suspicious passenger and tied up his feet, but he started spitting and swearing.... "So we duct-taped his mouth shut.... He was able to get that off himself. He almost choked himself by swallowing the duct tape." Then they secured a surgical mask over his face "just to get him to kind of shut up and stop spitting all over everybody." man had a boarding pass but wasn't on the passenger list.