Investigators followed a critical clue that led to the arrest of the Chicago doctor suspected in the killings of his ex-wife and her dentist husband in Ohio.
Michael David McKee, 39, was arrested in connection with the double murder of Spencer Tepe, 37, and Monique Tepe, 39, who were found dead at their Weinland Park home around 10 a.m. Dec. 30, officials have said…