(CNN) The young couple wrapped their arms around each other as they pumped gas during their road trip in Canada -- a quick but intimate embrace captured by surveillance cameras.

North Carolina resident Chynna Deese, 24, cleaned the windshield of the blue Chevrolet van while her Australian boyfriend, Lucas Fowler, 23, filled the gas tank. Then they got back on the road and made their way through British Columbia's pristine wilderness.

On July 15, two days after that brief stop in Fort Nelson, they were found shot dead on a remote highway in northern British Columbia. Fowler's van sat nearby.

Surveillance video shows Deese and Fowler at a gas station two days before their bodies were found.

Four days later, as police searched for clues on the killers and panicked residents in the rural north shuttered their homes, tragedy struck again.

Nearly 300 miles away from the crime scene, the body of Vancouver university professor Leonard Dyck was discovered near a burning car. Investigators believe all three victims were killed by a pair of teenagers prowling the area.

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