On Tuesday, the FBI announced it could not uncover what drove Stephen Paddock to kill 58 people, honored at a memorial, and injure hundreds more in October 2017 in Las Vegas. Drew Angerer/Getty Images hide caption
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Clark County Sheriff Joe Lombardo announced the end of the department's investigation of the October 2017 mass shooting in Las Vegas on Friday. Lombardo told reporters that officials could not determine a "definitive motive" that prompted the massacre. John Locher/AP hide caption
Slide Fire Solutions announced Tuesday it will stop taking orders for its line of bump stock products on May 20. George Frey/Getty Images hide caption
Stephen Paddock smiles as a valet helps him transport luggage to his hotel room on Sept. 26. MGM International Resorts hide caption
Douglas Haig held a news conference after being charged with selling unlicensed bullets to Stephen Paddock, the gunman behind the Las Vegas massacre. Brian Skoloff/AP hide caption
A small sledgehammer, bullet casings and broken glass are seen in this photo of the interior of Stephen Paddock's room at the Mandalay Bay hotel in Las Vegas, where he carried out a massacre in October. Las Vegas Metropolitan Police Department hide caption
Newly released court documents suggest the Las Vegas shooter's girlfriend, Marilou Danley, acted quickly after the Oct. 1 shooting to conceal her relationship with Paddock. Mark Ralston/AFP/Getty Images hide caption
The 58 fatalities in October's mass shooting in Las Vegas were all caused by gunshot wounds, the county coroner and medical examiner said Thursday. A makeshift memorial on the south end of the Las Vegas Strip a few days after the shooting has photos of some of those who were killed. Robyn Beck/AFP/Getty Images hide caption
Multiple lawsuits have been filed by victims of the Oct. 1 mass shooting in Las Vegas. The company that owns the Mandalay Bay, MGM Resorts International, is among the parties being sued. Robyn Beck/AFP/Getty Images hide caption
Authorities say the Las Vegas gunman may have considered other music festivals to target, including Chicago's Lollapalooza, shown here in July 2016. Gabriel Grams/Getty Images for Samsung hide caption
Las Vegas Boulevard remained closed to traffic early Tuesday, near the scene of Sunday night's mass shooting in Las Vegas. Drew Angerer/Getty Images hide caption
After a gunman fired from windows in the Mandalay Bay Resort and Casino at the Route 91 Harvest music festival in Las Vegas, guitarist Caleb Keeter, who was on stage Sunday, is calling for gun control — "RIGHT. NOW." Mark Ralston/AFP/Getty Images hide caption
People hold hands in prayer while hiding inside an airplane hangar after a mass shooting in which dozens were killed at the Route 91 Harvest Festival in Las Vegas. Al Powers/Invision/AP hide caption
Crime scene tape surrounds the Mandalay Hotel in Las Vegas after a gunman in one of its rooms killed at least 58 people, with more than 500 others injured, when he opened fire on a country music concert late Sunday. Mark Ralston/AFP/Getty Images hide caption