Mother Of Missing Beaumont Children Dies Aged 92

Nancy Helen Beaumont has died aged 92, without knowing what happened to her three children.

Jane, 9, Arnna, 7, and Grant, 4, went missing on January 26, 1966, from Glenelg Beach near Adelaide.

Mrs Beaumont -- who never gave up hope her children would be found -- died at Eldercare Allambi, in Glengowrie on Monday, a death notice in The Advertiser said.

Australia's most notorious missing person's case still carries a $1,000,000 reward, as police continue to investigate.

The children had visited Glenelg Beach on Australia Day but did not return home. Mrs Beaumont and her husband, Jim, reported the children missing at about 7.30pm that night.

Arnna, Jane and Grant Beaumont. Photo: Supplied

According to witnesses, the children were seen in the company of a tall, thin, blonde man, who has never been identified.

Last year, a police commenced a dig at the New Castalloy factory in Adelaide, once owned by a person of interest in the disappearance, Harry Phipps.

Left: A police sketch of the man witnesses said they saw with the children the day they disappeared. Srouce: SA Police. Right: Harry Phipps. Source: Provided

It was the second time it had searched since 2013, after the first dig was found to have been done in the wrong place. Both digs did not recover any human bones.

Jim Beaumont, aged in his 90s, still lives in Adelaide.