The body of an Alton woman was found Tuesday morning, nearly a week after she had been reported missing by her family.

According to the Madison County Sheriff's Office, the body of Adria Jean Hatten, 39, was found in a secluded wooded area inside Horseshoe Lake State Park, which is south of Pontoon Beach.

Captain Mike Dixon with the Madison County Sheriff's Office says the investigation into Hatten's death is ongoing, and an official cause of death is unknown at this time.

Hatten was last seen leaving a friend's home in Wood River on January 21, around 10:30 a.m. Her vehicle was abandoned and stuck in a muddy field off of Big Bend Road in Madison at 9 a.m. last Tuesday, according to a Department of Natural Resources Officer.

Last week, the Sheriff's office reported that no evidence of foul play had been developed.

Assisting in the search were the State Police Air Patrol, Department of Natural Resources, Saint Clair Special Emergency Services Canine Division and members of the Illinois Law Enforcement Alarm System (ILEAS) Mobile Field Force.