Joseph Wilcox bravely tried to stop Jerad Miller in a Walmart during his shooting spree in Las Vegas, Nevada, on Sunday.
Jerad Miller and his wife Amanda had shot and killed two police officers, and wounded over a dozen more people.
Wilcox was armed with a handgun and a license to carry a concealed weapon when he saw Jerad enter the store with a rifle.
According to the Las Vegas Review-Journal, Wilcox came up behind Jerad with his gun drawn.
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However, Wilcox was unaware that Amanda was approaching him from behind. She reportedly shot Wilcox multiple times, killing him.
Wayne LaPierre, executive director of the National Rifle Association, said after the Sandy Hook mass shooting in 2012, "The only thing that stops a bad guy with a gun is a good guy with a gun," notes NPR.
According to Mother Jones, of the 62 mass shootings in America, not one has been stopped by a good guy with a gun.
Slate.com reported about Joe Zamudio who initially attempted to stop gunman Jared Loghner in Tucson, Arizona, with a gun, but admitted later he would have killed the wrong man had he pulled the trigger. Instead, he ended up knocking the real shooter, Loghner, on the ground.
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"I was very lucky," Zamudio told Fox News in 2011. "Honestly, it was a matter of seconds. Two, maybe three seconds between when I came through the doorway and when I was laying on top of [the real shooter], holding him down. So, I mean, in that short amount of time I made a lot of really big decisions really fast… I was really lucky."
Robert McMenomy, of the San Francisco division of the FBI, claims that good guys with guns who try to play hero actually increase the danger and confuse law enforcement about who is the criminal.
"In a scenario like [Tucson], they wouldn't know who was good or who was bad, and it would divert them from the real threat," McMenomy told Mother Jones.
The conservative website Breitbart.com pointed to incidents in which trained law enforcement or armed guards have stopped gunmen, which is not the same as the average gun owner coming to the rescue in LaPierre's fantasy.