Bergman’s body was found Monday at 3 p.m. near state Route 85 and Hazen Road in West Valley, outside Phoenix, according to Phoenix Police Department Sgt. Vince Lewis.
Maricopa County Sheriff’s officials found her body and contacted police, according to KTLA sister station KSWB in San Diego.
Phoenix police homicide detectives are investigating and have not made any arrests in her death.
Bergman was last seen at her home on 51st Avenue and Thunderbird Road on Aug. 4. She left her home and did not return.
Police arrested Bergman's ex-boyfriend on separate offenses while interviewing him about Kiera's disappearance. A search of his car turned up several stolen IDs, Phoenix television station KNXV reported. He was arrested and charged with 22 counts of aggravated felony theft and two counts of forgery.
Police have not given any indication that he has any connection to her disappearance.
Anyone with information about the investigation has been asked to call Silent Witness at 480-WITNESS. Tipsters can remain anonymous and may be eligible for a $1,000 reward.