UPDATE: Body of missing ATV rider discovered

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Body of missing ATV rider found

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FLAGSTAFF - The body of a man who disappeared in early January while riding an ATV has been discovered.

The Coconino County Sheriff's Officer reports human remains found at Chevlon Canyon Lake on Sunday afternoon were positively identified as Mark Russell Irby. Four Phoenix-area residents found the body and notified officials.

Irby sparked a massive search after he was reported missing on January 2 while riding an ATV in the area of Forest Lake. Irby's body was about 12 miles northwest from where the ATV was found abandoned on March 14.

A Flagstaff dentist positively identified the body as Irby through dental records. The medical examiner has not yet determined the cause of death.