Court psychologist quits after accusations of faking killer's IQ test results.

The chief psychologist who advises Cook County judges in mental competency matters has resigned amid allegations that he changed answers on a convicted murderer's IQ test and then lied about it in court last spring. Timothy C. Cummings of Cook County's Forensic Clinical Services submitted a letter of resignation earlier this month to his boss, Dr. Mathew Markos, a county official said.

Bruce Wisniewski, human resources administrator for the Circuit Court of Cook County reported that the letter did not say why Cummings was resigning, and neither Cummings nor his attorney returned calls Monday seeking comment. At the time of his resignation, Cummings had been placed on temporary unpaid suspension, Wisniewski said. The county was investigating allegations that Cummings changed answers on convicted killer Randall Jarrett's IQ test.

The issue came to light during a March 23 court hearing to determine if Jarrett had a high enough IQ to be eligible for the death penalty. Jarrett and his uncle robbed, beat and killed 50-year-old Herman Bailey on the North Side in 1997. Cummings gave Jarrett a comprehensive IQ test last year. The results showed he was "dull-average," but not mentally retarded.

During the March hearing, defense attorneys questioned the results after Cummings read a test answer that was more complete than what their copies of Jarrett's test showed. Defense attorneys then said they found another discrepancy in a test answer.

Cummings attributed the differences to a photocopying error. But defense attorneys claimed Cummings had changed Jarrett's responses to make him seem more intelligent -- and was now trying to deny it. Cummings denied in court that he did anything inappropriate, and in April he told the Sun-Times he would consult with an attorney and look for "some possible redress." Wisniewski said Cummings' resignation essentially has put an end to the county's investigation.