Manhunt underway after couple found dead on Canadian highway

Chynna Deese, 24, from North Carolina, and her Australian boyfriend, Lucas Fowler, 23, were murdered on a highway known as the "Highway of Tears," police said.
2:15 | 07/22/19

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Transcript for Manhunt underway after couple found dead on Canadian highway
his 100th birthday. That international murder mystery. A young American woman and her boyfriend found dead along highway in Canada. A manhunt now under wane and linsey Davis here. Eyewitnesses are now coming They certainly are and good morning. These are people who say they were driving along the notorious highway known as the highway of tears and saw the couple before their demise. Now the search for a killer as police try to determine if this was random or targeted. This morning, two families on opposite sides of the world are desperate for answers. Mourning the murder of this young couple. I don't know who would do something like this. This was someone's son, someone's daughter. Reporter: Police in Canada say 24-year-old chynna Deese, an American from North Carolina, and her 23-year-old Australian boyfriend, Lucas fowler died last week. Their bodies found alongside this remote highway. It's not yet clear whether Lucas and chynna were targeted or if this was a crime of opportunity. Reporter: Chynna's family said they recently set out on a road trip. Along the way their blue 1986 Chevy van broke down on highway 97 where they were spotted by this couple who drove by offering help. The gentleman insisted that they were okay and that he didn't need our help and that in that same day somebody so evil would do something so horrific to them, that's just terrible. Reporter: Their bodies were discovered the following day. Loved ones say chynna and Lucas shared a love of travel and adventure in we'll never get full closure on this and it will hurt the rest of our lives. And I want people to know, you know, who she was, she volunteered and she gave -- she wasn't materialistic and she was a beautiful person. Reporter: An Australian news agency reported a woman came forward saying she saw a bearded man arguing with the couple before they were murdered. A sketch artist will reportedly work with the woman to come up with a composite of the man and heard from chynna's dad saying he's afraid for others' safety because a homicidal maniac is on the loose. We turn to the cliff jump sparking a lot of reaction this

This transcript has been automatically generated and may not be 100% accurate.

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