U.S. has less than five percent of world's population, but had 31 percent of mass shootings in 1966-2012.
The gunman, John Russel Houser, turned the gun on himself after killing two.
The mass shooting killed 12 Americans and wounded 17 more on July 20, 2012.
The blog sharply contrasts with how friends and neighbors described Abdulazeez.
The suspected gunman, Bradley Stone, attacked his ex wife and her family.
Susan Klebold to write about her son's actions and her involvement in suicide prevention
Officers found the victims, including one person believed to be the shooter, who had died from a self-inflicted gunshot wound