15-year-old Makenna Thompson

15-year-old Makenna Thompson is described as five foot four inches in height and weighing 100 pounds, with hazel eyes and brown hair. Photo courtesy of the Helena Police Department. 

(UPDATE - THU 4:24 PM) - Deputies with the Roane County Sheriff's Office in Tennessee have arrested a Helena man Thursday for reportedly taking a 15-year-old girl who was reported as a "missing and endangered person" on May 21.

21-year-old Garret Poteet was wanted by the Lewis and Clark County Sheriff's Office for custodial interference, a felony. 

According to WBIR News, Poteet's arrest took place Wednesday after the deputies received a tip from the FBI about his and Makenna Ann Thompson's location at a home in the county.

Deputies said they approached the home, and asked for Poteet to leave the site. He was arrested soon after. 

Makenna, who was also at the home, has since been placed into protective custody until her parents can be contacted. 

(UPDATE - Sat 6:06 PM) - The Missing Endangered Person Advisory for Makenna Ann Thompson has expired, according to an email sent to KFBB. 

As of Saturday evening, Makenna has not been located but authorities believe she is still in Montana. 

If you have any information, you can call the Helena Police Department at (406) 442-3233 or 911. 

(UPDATE - Sat 10:10 AM) - 15-year-old Makenna Ann Thompson has now been listed as a "missing and endangered person," according to the Helena Police Department. 

H.P.D. believes Makenna is with 21-year-old Garret Poteet, who is described as white, six foot three inches and weighing 300 pounds. He also has brown hair and green eyes. 

Makenna has been diagnosed as bi-polar, and H.P.D. says she is not taking her medication. 

Makenna likely left with Garett voluntarily, and that the two may be camping or heading to Colorado, according to police. They're both travelling in a dark green 2004 GMC Sierra crew cab pickup, with Montana Plates 581226A. 

Garret reportedly used his credit card in Ballantine, MT about three-to-four days ago.

If you have information about their location, you can call H.P.D. at (406) 442-3233.

HELENA – Police are asking for help in finding a 15-year-old girl who went missing.

The Helena Police Department describes Makenna Thompson as five foot four inches in height and weighing 100 pounds, with hazel eyes and brown hair.

H.P.D. says Makenna is not missing under any suspicious circumstances. She is the latest of several Helena teenagers who were reported missing in the past week.

Those with information about Makenna’s location can call H.P.D. at (406) 457-8865.

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