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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

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John Locher/AP

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

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Las Vegas Metropolitan Police Department

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

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Mark Ralston/AFP/Getty Images

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

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Robyn Beck/AFP/Getty Images

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

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Robyn Beck/AFP/Getty Images

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

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Gabriel Grams/Getty Images for Samsung

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

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Drew Angerer/Getty Images

Navy Veteran Survives Afghanistan, But Dies In Las Vegas Shooting

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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

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Mark Ralston/AFP/Getty Images

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

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Mark Ralston/AFP/Getty Images

What Is, And Isn't, Considered Domestic Terrorism

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