WENATCHEE, Wash. -- The reward to help find the killer of a 17-year-old Wenatchee High School girl is now up to $40,000.

Investigators are asking the public for more tips about the final days of Mackenzie Cowell whose body was found Feb. 13 along the Columbia River at Crescent Bar. Her cell phone, an LG EnV2, is still missing.

Cowell was last seen on Feb. 9 leaving a beauty school class in Wenatchee.

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