Desperate search for Arizona woman who vanished in Belize

Alison Mackenzie was last seen after taking a tour boat with her boyfriend.
1:06 | 01/23/20

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Transcript for Desperate search for Arizona woman who vanished in Belize
We are learning more tonight about that missing American mother in Belize. Her sister now speaking out, and here's ABC's Victor Oquendo. Reporter: Tonight, the desperate search for a missing mother from Arizona, vanishing while vacationing in Belize. 43-year-old Alison Mackenzie last seen Friday after taking a tour boat to rendezvous caye with her boyfriend, Paige rote. The couple spending the night on the island along with 15 other passengers and three crew members. Rote telling local police when they woke up the next morning, she was gone. At this time, there is not much to go on. Her personal belongings were found on the island. There is nothing to suggest that any craft or anything is missing at this time. Reporter: Police also saying Mackenzie was seen drinking the night before, a detail her sister is now questioning. I will say it is not like her to be intoxicated. Maybe have a drink, but to be intoxicated, like, I've never seen her drunk in my life. Reporter: The tour company, depicted here in this promogsal video, says they are cooperating with police. So far in their investigation, police in Belize have not named a person of interest, but say they're not ruling anything out. The U.S. State department is assisting local authorities. David? All right, Victor, thank you.

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

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