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 that there was no evidence linking Mr McIntyre to the cold case.
Jane, 9, Arnna, 7, Grant Beaumont, 4, went missing on Australia Day in 1966.
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 - were at the Glenelg beach in the days about January 26 that year.
Last year, police said they had reached a point where there were no leads left to follow.
© AAP 2017