An autopsy report of Las Vegas mass shooter Stephen Paddock revealed that he had anxiety drugs in his system, but didn't have any diseases, drug or substance use that could explain the cause of his behavior

The much anticipated autopsy report on Las Vegas gunman Stephen Paddock left no hints about why he carried out the deadliest shooting in modern U.S. history.

The report - released Friday in response to a lawsuit by The Associated Press and the Las Vegas Review-Journal - showed gunman Stephen Paddock had anti-anxiety drugs - benzodiazepines - in his system but was not under the influence of them because the drugs were found in his urine and not his blood.

Paddock's body didn't hold diseases or drugs or other substances that could have caused aggressive behavior.

In fact, it showed he was a sober, healthy 64-year-old.

The autopsy showed the 6-foot-1 (1.8 meters) Paddock was slightly overweight at 224 pounds (102 kilograms), had high blood pressure and bad teeth.

But there was nothing unusual in his physical condition, even after a microscopic brain examination conducted by experts at Stanford University.

His cremated remains were released to his brother in January.

Paddock unleashed a barrage of bullets from his high-rise hotel suite into a crowd at a country music festival below, killing 58 people and injuring more than 800 others on Oct. 1. He fatally shot himself before officers stormed his hotel suite after the mass shooting.

The motivation for the shooting has been a mystery since Paddock opened fire from the 32nd floor of the Mandalay Bay casino-hotel, despite intensive investigation by local police and federal authorities.

A preliminary report released last month by Las Vegas police said the high-stakes gambler had been on a losing streak, was obsessed with cleanliness, possibly bipolar and was having difficulties with his live-in girlfriend.

Paddock's autopsy revealed that he was slightly overweight at 224 pounds, had high blood pressure and bad teeth. No findings seemed to explain why he went on his shooting spree, which left 58 dead and more than 800 wounded at a music festival on October 2, 2017 (shown)

Police found 23 rifles and a handgun in Paddock's 32nd floor suite at the Mandalay Bay hotel

Paddock's autopsy report showed no unusual finding in his physical condition. Stanford University experts who conducted a microscopic brain examination did not find anything

Investigators believe Paddock acted alone and he did not leave a suicide note or manifesto before he was found dead in the room. Police found 23 rifles and a handgun in his hotel suite and more than a dozen of the rifles were fitted with 'bump stock' devices that allowed rapid-fire shooting similar to fully automatic weapons.

His live-in girlfriend, Marilou Danley, told investigators that Paddock had become 'distant' in the year before the shooting and their relationship was no longer intimate, according to the preliminary report released in January.

Danley had described him as germophobic and told investigators he had reacted strongly to smells. Paddock told his friends and relatives that he always felt ill, in pain and fatigued, the report said.

His doctor suspected he may have had bipolar disorder, but Paddock had refused to discuss that possibility, the doctor told police. The doctor offered him antidepressants but Paddock would only accept a prescription for anxiety medication. Paddock was fearful of medication and often refused to take it, the doctor told investigators.

Earlier Friday, Clark County District Judge Richard Scotti issued an unusual order to The AP and Review-Journal that an autopsy report about an off-duty police officer killed in the mass shooting, which was released by another judge last week, must be returned. The AP and Review-Journal are appealing.

In addition to ordering The AP and Review-Journal to return copies of Officer Charleston Hartfield's autopsy on Friday, the judge also barred the media organizations from further reporting on the autopsy's details.

The AP was filing an immediate appeal with the Nevada Supreme Court, said Brian Barrett, the news cooperative's assistant general counsel.

The autopsy record was one of 58 that another judge ordered the Clark County coroner's office to release last week to the two news organizations. The redacted documents had case numbers, names, ages, hometowns and racial characteristics of victims blacked out.