Mark Costello (November 10, 1955 – August 23, 2015) was an American politician and businessman who served as Commissioner of Labor of Oklahoma from 2011 to 2015.
[1] After taking office, he established a non-profit advocacy group to oppose the positions of public employee unions,[2] and fought federal regulations on family farms.
[3] Costello was born in Bartlesville and graduated from College High School, then attended the University of Kansas while working summers on oil rigs in the North Sea.
[5] Costello was fatally stabbed by his son, Christian, on August 23, 2015, at a Braum's restaurant in Oklahoma City.
[6][7][8] In 2018, Christian Costello was declared not guilty by reason of insanity, and was committed to a state mental hospital.