Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1
Situational Awareness
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway; Ground Incursion Taxiway
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance
Airport; Human Factors
I was working GC (Ground control). Aircraft Y had just landed RWY 31L and was instructed by LC (Local Controller) to turn right at either taxiway E or C4. LC observed Aircraft Y making a right turn off at C4 then cleared Aircraft X for take off (who I believe was in position at the time). I noticed Aircraft Y continuing a right handed turn onto an old decommissioned reverse exit (Juliet I believe was it's name). I immediately yelled to LC to stop his departure and that Aircraft Y was still on the runway. LC immediately canceled the takeoff clearance. By this time Aircraft Y had done a complete 180 and was slightly working his way southbound on the runway; eventually continuing a right hand turn for C4 again.The old reverse turn off 'stub' should have been and still should be completely demolished. Currently it exists as a approximately 50 foot piece of concrete coming of off C4. There are yellow painted X's however at night most likely difficult to see. Furthermore this airport would greatly benefit from an ASDE-X. This would have given LC an even better idea of the situation.
Tower Controller reported a runway incursion due to an aircraft taking the improper taxi route.