Overseas associates of a man who took off with his 11-year-old stepson are working with police, who are still trying to track him down.
John Beckenridge abducted Mike Zhao-Beckenridge from his Invercargill school in March 2015.
The pair camped in various places around the Catlins, before Beckenridge's dark blue four-wheel-drive went over a cliff near Curio Bay.
It took police six weeks to retrieve the wreckage - and there were no bodies inside.
The pair haven't been seen since.
Police say the inquiry is still live and some of Beckenridge's overseas associates are helping with the investigation.
Take your Radio, Podcasts and Music with you
Get the iHeart App
Get more of the radio, music and podcasts you love with the FREE iHeartRadio app. Scan the QR code to download now.
Download from the app stores
Stream unlimited music, thousands of radio stations and podcasts all in one app. iHeartRadio is easy to use and all FREE
