On Saturday, Jason Moore walked into Fifth Quarter Sports Bar and Pizzeria in East Peoria, Ill., pulled out a gun, and shot his ex-wife and her new boyfriend in the head. Lori Moore and Lance Griffel (above) were there for Moore's 15-year high school reunion, and at least 100 fellow attendees witnessed the killings.

The Peoria Journal Star reports that an off-duty FBI agent shot and killed Jason Moore after the shooting.

East Peoria Police Chief Ganschow praised the officer's bravery:

It's very difficult to say. You can play the 'what if' game over and over again, but I think it's pretty clear in his case the presence of this officer and his ability to take very quick and very decisive action prevented a further tragedy.

According to court records, the Moores were divorced in 2013.