A Columbus man has pleaded guilty to charges of killing his infant son by giving him a fatal mix of heroin and fentanyl last May. 30-year-old Kyle Black has pleaded guilty to an involuntary manslaughter charge in the death of 11-month old Dominic Dickinson. Sentencing is scheduled for June 1. Prosecutors say the boy's mother, 33-year-old Denise Dickinson, has been indicted in the case. Prosecutors say the parents were using the drugs and the boy consumed them during the overnight hours.