Matthew Mark Smith, 27, of Keller, Texas, was killed on May 17, 2015, during a violent shootout outside the Twin Peaks restaurant in Waco, Texas. He was a member of the Cossacks Motorcycle Club and died from gunshot wounds to the trunk amid an exchange of gunfire involving members of the Bandidos, the Cossacks and other smaller clubs who had gathered at the restaurant for a meeting.

Police were already in the area because of prior knowledge of potential violence and responded within seconds; officers also fired during the chaos. At least four victims, including Smith, were killed by police gunfire. Nine men in total were killed; investigators are working to determine who fired the fatal shots that killed each of them. More than 170 suspects were arrested and charged with engaging in organized criminal activity and held on $1 million bail, though the large prosecution effort has been described as a prosecutorial fiasco that resulted in zero convictions.

The shooting prompted extensive on-scene work, with investigators diagramming vehicles, blood spots, bodies and every piece of evidence. Family members continue to seek answers about how the confrontation unfolded and who fired the lethal rounds; anyone with information about Matthew Smith or the Waco shooting is asked to come forward.