The footage, captured from a motorcycle rider's helmet, appears to show the bearded Mr Thompson driving northbound on Sandgate Road through Nundah, north of Brisbane, just before 10:45am.
Timeline of disappearance:
March 7
Sam Thompson leaves his apartment at Albion in Brisbane's north about 9:20am in his orange 2016 Ford Mustang
Dashcam footage shows his car heading north on Sandgate Road through Nundah about 10:45am
The car is spotted again at Deep Water Bend Reserve at Bald Hills at 1:00pm, remaining there until the following day
March 8
The car is sighted on Tweed Coast Road in Wooyung, in northern New South Wales, about 7:30pm
March 9
Mr Thompson's car is found abandoned on Tweed Coast Road
His car, which has the licence plate SAMMO, was found abandoned near Byron Bay, in northern New South Wales, two days later.
Investigators and the SES spent the weekend searching Deep Water Bend Reserve in Brisbane's north — where the vehicle was sighted on March 7 — but failed to find any clues.
http://www.abc.net.au/news/2017-03-...m-thompson-probably-killed-police-say/8349310