TUCSON, Ariz. (13 News) - A nonprofit organization is helping aide in the ongoing search for a missing University of Arizona graduate.

35-year-old Hoi Kei Woo, also known as Patricia, disappeared nearly four months ago.

The Pima County Sheriff’s Department says she was last seen on April 18th and was reported missing the following day. Her vehicle was discovered at Windy Point on Mt. Lemmon on April 20th, but Patricia was nowhere to be found.

Despite extensive efforts by the Pima County Sheriff’s Department, there has been no sign of her.

For two years Casey and Christina Smith have been helping aide in search and rescue operations across Arizona through their nonprofit Sonoran Valley Search, Trauma, Rescue, and Recovery.

The volunteer group is now using advanced technology to try an

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