In the early hours of Nov. 2, 2013, in Dearborn Heights, Michigan, a pounding at the door startled Theodore Wafer from his slumber. Unable to find his cell phone to call the police, he grabbed the shotgun he kept loaded in his closet. Wafer opened the door and, spotting a dark figure behind the screen, fired a single blast at the supposed intruder. The shot killed a 19-year-old girl who was knocking to ask for help after a car accident.
Shortly after midnight on June 5, 2014, two friends left a party briefly. Upon returning they accidently knocked on the wrong door. Believing burglars were breaking in, the frightened homeowner called the police, grabbed his gun and fired a single round, hitting one of the confused party-goers in the chest.
On Sept. 21, 2014, Eusebio Christian was awakened by a noise. Assuming a break-in, he rushed to the kitchen with his gun and began firing. All his shots missed but one, which struck his wife in the face.