Detectives from the Phelps County Sheriff's Department and Missouri State Highway Patrol continue to investigate an unidentified woman found dead on the shoulder of Interstate 44.

The unidentified white woman was found on Saturday shortly before 1:30 a.m. Citizens called 9-1-1 when they spotted the body.

The woman was wearing a blue and red colored sun dress and flip-flops. Her hair was dark but had been dyed dark blue. She had several tattoos on her right and left shoulder blade area (below), and one on her right foot and ankle (above). She also had a large scar on her left inner thigh.

An autopsy in Columbia on Monday did not immediately determine the cause of death or the woman's identity. Investigators now believe she was between 25 and 35 years old, after initially believing she might be younger than that.

Click on each image to see full photos of the woman's tattoos.