Feb. 5 preliminary hearing set for son in politician's death November 17, 2015 at 10:14 PM CST - Updated July 27 at 5:05 AM OKLAHOMA CITY (AP) - An Oklahoma County judge has scheduled a Feb. 5 preliminary hearing for a man accused in the stabbing death of his father, Oklahoma's labor commissioner.Special Judge Lisa Hammond scheduled the hearing Tuesday for 27-year-old Christian Costello. Costello's charged with first-degree murder in the death of 59-year-old Mark Costello.The preliminary hearing will determine whether a crime was committed and whether there is probable cause Christian Costello committed it.Prosecutors say Costello attacked his father with a knife and repeatedly stabbed him on Aug. 23 at an Oklahoma City restaurant. A judge has entered a not guilty plea for Costello.His family says he suffers from mental illness and court records show he's been in a mental health facility. Defense attorney Bob Ravitz says a private psychiatrist is examining Costello.Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.