According to the Oakland County sheriff's department in Michigan, the man decided to demonstrate the safety of his three handguns, which he believed were unloaded, by placing each to his head and pulling the trigger.
Unfortunately for the man, and his girlfriend, the third gun was loaded. When the man pulled the trigger, it fired. He was pronounced dead at the scene.
"(The situation) is pretty unique, as I have never heard of anyone testing out the safety of a gun by pointing at their head and pulling the trigger," Undersheriff Michael McCabe told the Oakland Press.
Three young children—ages 7, 10, and 12—were at the man's home at the time, but none of them were injured or witnessed the incident.
The girlfriend later told police the man had been drinking all day and was drunk at the time of the shooting.
This isn't the first time a man has died during a gun safety lesson. From the Huffington Post:
In January 2013, 18-year-old Florida resident Alexander Xavier Shaw died doing a similar demonstration. Richard M. McLean, a 22-year-old from Michigan, died in a similar fashion in June 2012. Missouri resident James Looney, 40, was also teaching his girlfriend about gun safety when he shot himself in the head in September 2009.