Walmart sold a gun to an employee with history of mental illness, lawsuit says. He killed himself two hours later.

In the United States, more than half of all suicides are by firearms. Compared to other methods that do not as consistently result in death, 85 to 95 percent of all suicidal incidents result in death when a gun is used, according to Michael D. Anestis, who researches firearms, suicide and public safety at Rutgers University and is executive director of The New Jersey Gun Violence Research Center.