60 Minutes reports the Las Vegas gunman Stephen Paddock took notes and calculated the distance from his window to the victims below and the trajectory of his bullets from the height of his room to “know where to shoot” and kill his victims below. The calculations were on a note found by the police who stormed Paddock’s room and were the first to see his body, the number of weapons, and ammunition in his hotel room.

As part of the 60 Minutes episode that airs on Sunday, October 8th, Bill Whitaker speaks with Clark County Sheriff Joseph Lombardo. Other police officers were interviewed on the report including Las Vegas Metropolitan Police Department Detectives Casey Clarkson and Matthew Donaldson, and Sergeant Joshua Bitkso and officer David Newton from the K9 unit.

Officer Newton explained that he found a note on the nightstand near his shooting platform. “I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was going to be for the crowd. So he had had that written down and figured out so he would know where to shoot to hit his targets from there.”

Newton added Paddock, “had written we must have done the calculations on line or something to figure out what his altitude was going to be and how high up he was-how far out the crowd was going to be and what at that distance and what the drop of his bullet was going to be. He hadn’t written out the calculations all he had was written out he final numbers that were on the sheet.”

On Sunday evening, a gunman opened fire at a country music festival killing at least 58 people, not including the gunman, and injuring over 500 more near the Mandalay Bay hotel-casino.

According to reports, Marilou Danley is the girlfriend of Stephen Paddock, the man who killed nearly 60 people at a music festival in Las Vegas. Danley returned to the United States from the Philippines, according to the recent reports. Danley, who is 62, was met at Los Angeles International Airport by FBI agents on Tuesday night after flying from Manila. Investigators reportedly told Danley she was a “person of interest” in the investigation.

USA Today reports Danley was born in the Philippines and moved to Queensland in eastern Australia during the early 1980s. She is said to have left Australia for the United States in 1989, where she worked in casinos. USA Today reports Danley first arrived in the Philippines on September 15th and departed on September then returned three days later on a flight from Hong Kong.

Before Danley moved in with Paddock and became a “person of interest,” she was described as a “Great neighbor” and would host parties and sleepovers for the neighborhood kids.

Danley’s sister said they believe Paddock sent her out of the country so she would not interfere with his plans, Australian media outlets reported on Wednesday. Her two sisters, who currently live in Australia, were interviewed by Australia’s Channel 7 network.

“She was away so that she will be not there to interfere with what he’s planning,” one of the women told Channel 7. “She didn’t even know that she was going to the Philippines until Steve said ‘Marilou I found you a cheap ticket to the Philippines’.” She went on to describe her sister as “a good person and gentle soul,” and said she “seemed madly in love with Steve.”

Paddock reportedly transferred $100,000 to the Philippines days before the shooting. But it is not clear whether or not the money was sent to Danley. At this time, USA Today reports the FBI is trying to trace where the money went.

Police have not revealed the type of weapons that Paddock used in the mass-shooting. That said, in the state of Nevada, gun owners do not need a permit to buy a rifle, shotgun or handgun. Also, Nevadans can purchase machine guns or silences, weapons that are banned in other states, as long as they comply with federal regulations. “He passed every federal background check, every time he bought a gun,’’ owner Janis Sullivan, 67, told USA TODAY.