The Illinois Department of Public Health has found 48-year-old Randy Swopes can stand trial in Lake County on child endangerment and unlawful restraint charges.
Swopes is scheduled to appear in court Jan. 15 for a hearing in which his attorneys can either accept or challenge the fitness determination.
After previously being deemed unfit for trial, Swopes was held in a secure treatment facility in Elgin for treatment.
Swopes and his wife, Katherine, are accused of keeping their daughter in a basement room for months.
"During the course of the investigation a statement had been made by at least one of the suspects that they believed the 10-year-old child was possessed by a demon," said Commander Joe Florip, Waukegan Police Department.
Police discovered the girl living in the basement in poor conditions in the 200-block of Liberty Street on July 17, 2018, thanks to an anonymous tip.
"She was showering with a bucket, she was using the bathroom in a child's port-a-potty, she had very, very limited access to the outside," Frolip said.
Since at least January, the girl was locked in the basement at night and had limited access to the outside, police said. The girl was given a training toilet for a bathroom and showered from a bucket, police said. Investigators also believe she was kept away from her siblings - ages 7, 13 and 15.
Katherine Swopes, 49, is free on a $25,000 signature bond and is prohibited from contacting the victim and three other children.
The Associated Press contributed to this report.