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Authorities are searching for Marcus Turowski, who went missing Sunday on a hike that killed one man and hospitalized another because of the record high temperatures.

Three people died, and one man remains missing, in separate incidents as record-breaking heat in the valley made outdoor activities dangerous in the Tucson area. Sheriff Chris Nanos said, "We're asking people not only to avoid outdoor activity to the morning, but just to avoid it entirely." Read more»