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DENVER -- Tuesday's "Everyday" hosts, Ken Clark and Kathie J., proudly introduced local musician Heather Nicolson on their April 1 show. According to the scripts in front of them, Heather had been given the opportunity of a lifetime: She was set to open for Fleetwood Mac at their upcoming concert at the Pepsi Center in June.

Toward the end of the segment, Heather was gearing up to play live on our set when everything started falling apart.

"These lights are really hot," she complained. "How many people watch this show?"

Ken and Kathie cheered her on, offering encouragements like "if Fleetwood Mac wants to share the stage with you, take as much time as you need." At one point, Ken even grabbed a couch cushion and started fanning Heather in an effort to get her some air.

It was no use. Heather continued to panic, and before Ken and Kathie could cut to a commercial break, she sprinted off the set yelling "I gotta go!" You can watch it in the video above.

Well, as it turns out Heather isn't a local musician, she's a local actress -- something Ken and Kathie found out when they returned from that commercial break.

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As they were preparing to start a new segment, the co-hosts got an on-air phone call from regular co-host Chris Parente, who was conveniently away on vacation. He explained how he and Heather collaborated to pull off the April Fool's joke. Parente's regular co-host was sufficiently amused. As for Ken, let's just say he may or may not ever fill in for Parente again.

Watch the video above to see the joke, and the video below to see the aftermath.

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