Police are searching for a couple they believe might have camped at Neils Bend alongside missing woman Ruth Ridley and estranged husband Gary Ridley.
NSW police have said they believe Ruth and Gary Ridley might have died in an apparent murder-suicide but have not been able to locate Ms Ridley.
On Monday, police issued a statement saying they were seeking the help of two people who may have been camping in the Neils Bend Murray River Nature Reserve on Tuesday 22 October 2019.
Last month, detectives attached to Riverina Police District established Strike Force Alysse to investigate the disappearance of 58-year-old Port Macquarie woman Ruth Ridley.
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Police said two people, believed to be aged in their late 50s to 60s, might reside in the Tumbarumba area and possibly drive a 100 series Toyota Landcruiser or similar vehicle.
They have been described as having a dual axle caravan with distinctive yellow s-core pig-tail gas lines on twin gas bottles mounted on the caravan A-frame.
Police believe the couple intended to camp at Neils Bend for the week and may have been in the area on the 26 and 27 October 2019, when it is believed the missing woman was camping there with her estranged husband, Gary Ridley.
Police would like to hear from the couple or anyone who may know their identity as they may be able to assist with the investigation.
Anyone with information should contact CrimeStoppers on 1800 333 00 or Strike Force Alysse Detectives on 6947 7119.