Beaumont children: Man linked to the 50-year-old cold case dies

A man linked to the disappearance of the three Beaumont children more than 50 years ago has reportedly died.

Allan "Max" McIntyre died aged in his late 80s at a nursing home on South Australia's Yorke Peninsula on Tuesday, the Adelaide Advertiser reported.

Police previously said there was no evidence linking Mr McIntyre to the cold case.

Jane, nine, Arnna, seven, Grant Beaumont, four, went missing from Glenelg Beach on Australia Day 1966 sparking one of the largest criminal investigations in Australian history.

Mr McIntyre's son, Andrew McIntyre, this month revealed to Fairfax Media that his father and family friend Anthony Alan Munro - who will soon be sentenced for 10 child sex offences - frequented Glenelg Beach in the days leading up to January 26 that year.

Mr McIntyer was one of Munro's victims.

He gave a statutory declaration stating he was meant to visit Glenelg Beach on the fateful day with his father and Munro but was instead told to go home.

He claims both men ended up going themselves in the company of other young men, and that both were upset upon their return.

Mr McIntyre also claims he witnessed sand and blood in Munro’s car.

Max McIntyre’s daughter Ruth Collins previously accused her father of involvement back in 2007, however police found no evidence to support the claim.

Last year, police said they had reached a point where there were no leads left to follow.