More than 10 months after the deadliest mass shooting in modern U.S. history, police say they are closing their investigation.

Clark County Sheriff Joe Lombardo said the shooter was “an unremarkable man” who showed signs of a troubled mind leading up to the October 1st shooting at the Route 91 Harvest festival on the Las Vegas Strip, but authorities don’t have any clear answers as to why it happened. The police have concluded that because they have found no evidence of a second shooter that night, no one else will be charged in connection with the tragic massacre that left 58 dead.

Officials have said the attack had no link to international terrorism, but hotel owner MGM Resorts International last month invoked a provision of a federal law enacted after the September 11th terror attacks. They want federal courts to qualify the shooting as an act of terrorism and to declare the company has no liability to survivors or families of slain victims.

Keep up with the latest trending music news by following us on FacebookTwitter, and Instagram.