The man who murdered over 50 people and injured hundreds is still a puzzle to investigators. He was a multi-millionaire who owned several properties and gambled often. What happened to make him commit such a horrific crime? What authorities just found might be another clue to this puzzle:

Clark County Sheriff Joseph Lombardo told reporters Monday that ammonium nitrate, a chemical compound used to make homemade bombs was found in the Las Vegas shooter’s car.

Stephen Paddock, 64, opened fire on concert-goers in Las Vegas, Nev., Sunday night killing at least 59 and injuring more than 500 people.

This is a new discovery in the investigation of the horrific shooting and comes after details emerged of how Paddock opened fire from the 32nd story of the Mandalay Bay hotel at 10:08 p.m. local time, into a crowd of 22,000 gathered at a Jason Aldean concert, and then killed himself. Read more: DC

We are learning more about the background of the shooter including his gambling habit and ownership of several properties that police are now scouring for evidence. Paddock moved 27 times! He lived in Texas and Florida before ending up in Nevada.

He owned two planes and a $400,000 house in a retirement community. His brother claims he was a multi-millionaire:

The brother of alleged Las Vegas shooter Stephen Paddock said Monday he was a multimillionaire who worked in real estate.

The Associated Press reports that Eric Paddock said his brother also worked as an accountant and that he was unaware of him having any money problems.

At least 58 people were killed and 500 others were injured after gunfire broke out at a country music festival near the Mandalay Bay hotel in Las Vegas Sunday night.

Police say Stephen Paddock fired on the crowd at the concert from the 32nd floor of the hotel. He was found dead in his room when police breached the door.

The FBI said on Monday that its investigation had turned up no “connection with an international terrorist group.”

Read more: The Hill