Grant Alfred Beaumont, the father of the three Beaumont children who disappeared in Adelaide in the 1960s, died at the age of 97.

The disappearance of Jane, Arnna, and Grant Beaumont on Australia Day in 1966 has remained one of the country’s unsolved mysteries.

The three children, ages nine, seven, and four, went to Glenelg Beach for the day but never returned.

Grant, also known as Jim, was “reunited in heaven” with his children, according to a funeral notice published on Saturday.

He passed away on April 9th.

On January 26, 1966, just before 7:20 p.m., Mr. Beaumont reported his missing children to Glenelg Police, and he assisted police in conducting a thorough search of the beach area.

Later that night, he authorized police to make public announcements on local radio stations in order to help locate the children.

Former South Australian victims of crime commissioner Michael O’Connell told the ABC that Mr Beaumont had “unresolved grief” for decades.

Mr Beaumont was a private person who kept his emotions to himself, according to Mr O’Connell, who worked with the family.

“Since the Beaumont children went missing, there’s been a lot of speculation, innuendo, and even hoaxes about those kids, their whereabouts, and what happened to them,” he said.

“It’s a mystery, and it’s a mystery that appears not to be readily solved.”

Several witnesses told police that they saw the children with a tall, thin-faced man with short, blond hair when they went missing.

In an effort to identify the suspect, a composite sketch of him was made public.

The largest-scale search in the history of South Australia was aided by volunteers.

A large number of witnesses came forward, the Glenelg beach was cleaned, and the drains were flushed.

2016 marked the 50th anniversary of the children’s disappearance, and police issued a fresh appeal for information.

Within the first few months, they received hundreds of calls and looked into at least 37 potential suspects.

Police dug at an Adelaide factory site in the early months of 2018 in search of the children’s remains.

The dig was prompted by two brothers who told police they had once dug a hole for the factory’s owner, Harry Phipps, who was a person of interest in the Beaumont case.

Nancy Beaumont, the mother of the kids and Mr. Beaumont’s former spouse, passed away on September 16, 2019, at the age of 92.