Amber Alert for 7-Year-Old Aja Johnson

7-year-old Aja Johnson was last seen Saturday night in Geronimo, Okla.

Jan. 25, 2010 — -- An Amber Alert has been issued for a 7-year-old girl who authorities believe may be with the man who is a person of interest in the murder of her mother this weekend.

Aja Johnson, described as a 65-pound, 4-foot tall young girl with brown eyes and brown hair, and was last seen Saturday evening at her Geronimo, Okla., home.

Her abduction is believed to have occurred sometime before 9 p.m. Sunday, when the body of her mother, 37-year-old Tonya Hobbs was found dead in her RV by authorities at the Comanche County Sheriff's Office.

Calls made to Comanche County Sheriff Kenny Stradley for comment regarding the case were not immediately returned, but a statement about the death of Tonya Hobbs was released by the Oklahoma State Bureau of Investigations, which is helping with the investigation.

"Investigators do believe she was murdered," the statement said.

The cause of death is not yet known, according to the OSBI. The medical examiner's office is performing an autopsy on the body today.

The man who is a person of interest in Hobbs' death and who authorities believe may have now also kidnapped Aja is 46-year-old Lester Hobbs. Hobbs, who is not Aja's biological father, is estranged from the girl's mother and used to live with Tonya Hobbs in Davenport, Okla.

Aja and her mother were visiting Hobbs at his sister's home prior to the murder and disappearance, according to authorities.

Hobbs is driving a white 1992 Toyota Paseo with Oklahoma license plates that read 577-BPW. The back window of the two-door car has been replaced with a piece of sheet metal, according to The National Center for Missing & Exploited Children, and the vehicle has no hubcaps.

Person of Interest In Aja Johnson's Disappearance Is Believed to Be Dangerous

Hobbs is believed to be dangerous. Public records show that he served time in 2003 for assault with a deadly weapon.

Anyone with information about Aja is asked to contact the Comanche County Sheriff's Office at 580-353-4280.