May God's peace overwhelm your heart today. In gratitude for Mark Costello's service and friendship to Oklahoma, we…

Posted by Estela Hernandez on Monday, August 24, 2015

Mark Costello was a tremendous leader, colleague and most importantly friend to all of those at the Oklahoma Department…

Posted by Entrepreneurial Excellence in Oklahoma on Monday, August 24, 2015

I was shocked and greatly saddened to hear of Labor Commissioner Mark Costello's tragic death last night. My prayers and…

Posted by Governor Mary Fallin on Monday, August 24, 2015

My family is stunned and deeply grieved to hear of the tragic death of Labor Commissioner Mark Costello. Mark was…

Posted by Senator James Lankford on Sunday, August 23, 2015

Mark Costello was a true servant to the state of Oklahoma and considered to be an up-and-coming leader in our state. He…

Posted by Senator Jim Inhofe on Monday, August 24, 2015

I was deeply saddened to learn of the death of our state Labor Commissioner, Mark Costello. Mark was a true public…

Posted by Congressman Markwayne Mullin on Monday, August 24, 2015