CMH CTLR EXPERIENCED LOSS OF SEPARATION AT 4000 FT AS DEP ACFT FAILED TO STOP AT EXPECTED ALT OF 3000 FT AS PER THE LOA.

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TZR TWR CALLED FOR RELEASE OF KING AIR. TZR WAS USING RWY 4; WHILE WE (CMH) WERE ON A RWY 10 OP. THAT MEANS THE R DOWNWIND TO OUR FINAL HAS ACFT DSNDING TO 4000 FT AS THEY FLY WBOUND NEARLY DIRECTLY OVER TZR. OUR RELEASES ARE ALWAYS TO 3000 FT (LOA) THE KING AIR WAS A NORTH GATE DEP; BUT DUE TO FINAL RADAR'S TFC LOAD; I ISSUED AN INITIAL SOUTHEASTERLY HDG SO AS TO GET THE ACFT AWAY FROM THE ACFT ON FINAL APCH INTO CMH. THE KING AIR DEPARTED; AND CONTACTED ME. I RADAR IDENTED; AND ADVISED OF WBOUND TFC AT 4000 FT JUST SE OF HIM AS HE WAS TURNING TO THE INITIAL HDG. I DID NOT ISSUE HIGHER. I POINTED OUT THE KING AIR TO FINAL RADAR; AND GOT APPROVAL TO CLB ONCE PAST HIS OPPOSITE DIRECTION 4000 FT TFC. I WAS JUST TUNNELING THE KING AIR; WAITING FOR THE ACFT TO PASS. HOWEVER; JUST AS THE TARGETS WERE PASSING SIDE-BY-SIDE; CONFLICT ALERT ACTIVATED AND I DISCOVERED THE KING AIR CLBING! I ADVISED THE PLT THAT HE WAS ONLY ISSUED 3000 FT. THE PLT REPLIED; SAYING HE WAS INITIALLY ISSUED 4000 FT! IT MAKES NO SENSE THAT TZR WOULD HAVE ISSUED ANYTHING OTHER THAN THE LOA ALT OF 3000 FT. AND I CERTAINLY HAD NO REASON TO ISSUE A CLRNC TO ANYTHING HIGHER. THE FINAL RADAR CTLR ADVISED THAT HIS PLT HAD THE KING AIR IN SIGHT; AND THE PLT SAID HE WAS MAINTAINING VISUAL SEPARATION FROM THE KING AIR. HOWEVER; EVEN THOUGH I WAS NOT WORKING THAT POS; I'M PRETTY CERTAIN THIS EXCHANGE OCCURRED 'AFTER' SEPARATION WAS LOST. I ASKED THE SUPVR; WHO WAS BUSY WORKING N RADAR; WHETHER I SHOULD HAVE THE PLT CALL OUR FACILITY. HE FLATLY REPLIED 'NO.' I DID NOT QUESTION HIS DECISION. AS TO WHAT CONTRIBUTED TO THIS LACK OF SEPARATION; I FEEL CERTAIN THAT THE KING AIR PLT SIMPLY BUSTED HIS ASSIGNED ALT. WITH REGARDS TO WHAT CONTRIBUTED TO THE LACK OF RPTING AND FOLLOW-UP OF THIS 'DEAL;' I PRESUME THAT THE SUPVR PROBABLY FELT HE DID NOT NEED YET ANOTHER HEADACHE THAT EVENING. HE WAS ALREADY FACED WITH WORKING SHORT STAFFED; AND WAS HIMSELF FILLING IN ON RADAR. HE PROBABLY FINDS HIMSELF IN THE MIDDLE; TRYING TO APPEASE UPPER MGMNT (NO OVERTIME USED) WHILE SIMULTANEOUSLY 'KEEPING HIS TROOPS HAPPY.'