American woman, Australian boyfriend killed during road trip in Canada

Chynna Deese and Lucas Fowler were found dead on a road in Canada, and authorities are investigating whether they were shot.
2:05 | 07/20/19

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Transcript for American woman, Australian boyfriend killed during road trip in Canada
Now to a murder mystery on a highway in Canada. An American woman and her boyfriend killed during a road trip. Marci Gonzalez is in our los Angeles bureau with what that woman's family is saying. Good morning, Marci. Reporter: Good morning. They are of course heartbroken saying the two were brutally killed. While police aren't sharing many details, the big concern is that the killer is still on the run. This morning, an urgent manhunt in the mysterious murder of an American woman and her boyfriend in Canada, their bodies found along the side of a rural highway. I don't know who would do something like this. This was someone's son, someone's daughter. Reporter: Chynna Deese's mother says the 24-year-old from Charlotte and her boyfriend, Lucas fowler, had just set out on a road trip to see Canada's national parks when they were killed some time between Sunday evening and Monday morning, their van found parked nearby. This is an international murder case in Canada of an Australian and an American, and still no large public travelers notice or anything. Reporter: Police are also not saying how they were killed. Now urging anyone who was on that stretch of Alaska highway 97 in British Columbia and may have dashcam video from the area to call investigators who are desperately scouring for leads. We're trying to comb through the evidence that is at the scene at this point. Reporter: Deese's family concerned the killer is still free. This morning they are pleading for answers. It doesn't add up and it's concerning, and we're never going to get full closure on this. It's going to hurt the rest of our lives. Fowler's father is a senior police officer in Australia. This morning his colleagues say they've learned both victims were shot to death. Investigators in Canada are also clarifying that this does not appear to be connected to any other cases and they call finding this killer their top priority. Dan. Let's hope it is. Marci Gonzalez, thank you very

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

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