MEM GND CTLR DESCRIBED PLTDEV WHEN ACFT FAILED TO HOLD SHORT OF RWY 18C WITH TFC CLRED FOR TKOF ON SAME RWY.

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I WAS WORKING GND CTL 2 (GC2) DURING THE LAST PART OF THE NOON INBOUND. MEM WAS IN A S CONFIGN; LNDG RWYS 18L AND 18R; DEPARTING RWY 18C. ACR X; A CRJ2; HAD JUST LANDED ON RWY 18L. I OVERHEARD LCL CTL 2 (LC2) ISSUE INSTRUCTIONS TO THE CRJ2 TO '...TURN R; JOIN TXWY S NBOUND; HOLD SHORT OF RWY 18C...' LC2 THEN CLRED ACR Y; A CL60; FOR TKOF FROM RWY 18C. SECONDS LATER; I HEARD LC2 YELLING 'ACR X; STOP; STOP; STOP' (OR WORDS TO THAT EFFECT). I LOOKED DOWN THE RWY AND SAW A CRJ2 ACROSS THE HOLD LINE OF RWY 18C AT THE INTXN OF TXWY E. THE CL60 WAS AIRBORNE APPROX 2000 FT PRIOR TO THIS SAME INTXN. THE CRJ2 CREW WAS INSTRUCTED TO CALL THE FACILITY. THE SUPVR INFORMED US THAT THE CAPT MADE AN ERROR AND THAT IT WAS THE COPLT WHO WAS TELLING THE CAPT TO 'HOLD SHORT' OF RWY 18C. BEFORE IT REGISTERED WITH THE CAPT THAT HE HAD MADE A MISTAKE; THE ERROR HAD ALREADY TAKEN PLACE. HE WAS VERY APOLOGETIC; DID NOT TRY TO OFFER ANY EXCUSES FOR WHAT HAPPENED; AND TOOK FULL RESPONSIBILITY FOR THE ACTIONS OF THE COPLT AND HIMSELF.