Richard Simmons’ cause of death at 76 is still unknown amid an investigation in to the fitness guru’s final hours – as the star was laid to rest in LA.

A police probe was launched after Simmons was found dead at his Los Angeles home on Saturday, July 13 after suffering a fall in his bathroom the night prior.

His death certificate obtained by TMZ does not have his manner of death listed – noting the manner of death is still pending an investigation.

Simmons – who is referred to as a ‘health motivator’ on the certificate has been laid to rest at the Pierce Brothers Westwood Village Memorial Park and Mortuary – where stars including Kirk Douglas and Marilyn Monroe are buried.

The TV star – who dropped out of the spotlight in the final years of his year – was a bachelor at the time of his death.

He never commented publicly on his sexuality but was a revered gay icon.

‘The LAPD are not pursuing the investigation as if foul play was involved at this point,’ a law enforcement source told PEOPLE on Thursday.

Simmons’ preliminary cause of death was revealed Monday by the Los Angeles Fire Department after it was confirmed police were investigating the matter.

It was announced via a statement that Simmons had died of ‘apparent natural causes.’

‘On July 13, 2024, at 9:55 AM, the LAFD responded to a Suspected Death Incident at the 1300 block of N Belfast Drive,’ LAFD Captain Erik Scott told Entertainment Tonight.

‘Upon arrival, one rescue ambulance discovered a 76-year-old male who was pronounced deceased on-scene by firefighter/paramedics due to apparent natural causes. As a result, no hospital transport was necessary,’ he concluded.

Police officers and firefighters were dispatched to Simmons’ home in Los Angeles after receiving a call from his housekeeper.

Simmons was found dead just one day after he celebrated his 76th birthday.

Police officials confirmed to PEOPLE on Monday that Simmons’ death was under further examination, and that the case had been deferred by the Medical Examiner’s Office, which calls for a further probe and tests to be conducted, according to the outlet.

The examination can span as long as three months until an official ruling is issued, the outlet reported.

Authorities pronounced Simmons dead at the scene, according to the outlet, and foul play was not suspected in connection with the death, which was going to be probed as under natural causes.

Members of the LAPD’s Robbery Homicide Division also responded to the call due to the high-profile person who had died, the outlet reported.

Police subsequently told the outlet that Simmons had fallen in the bathroom of his home on Friday – which marked his 76th birthday – and that his housekeeper had attempted to persuade him to seek immediate medical help.

Simmons declined because it was his birthday and he didn’t want to go anywhere, informing her that he might go on Saturday. The housekeeper helped him safely get back to his bedroom, where she found him the following morning on the floor at around 10 a.m., according to the outlet.