CTLR RPTS THE DSCNT OF A BE58 PLT TO 3500 FT WITHOUT CLRNC OR COM.

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WHILE WORKING THE N RADAR POS; I ACCEPTED A HDOF. THE ACFT WAS MAINTAINING 4000 FT; THE TWR LIMITS OF THE OTHER SECTOR. I NOTICED THE BE58 DSNDING AND TRIED TO CALL HIM WITH NO RESPONSE. I HAD THE OTHER SECTOR CALL HIM AND THEY RECEIVED NO RESPONSE. I INFORMED THE OTHER SECTOR THAT THE ACFT WAS DSNDING AND I DID NOT HAVE COMS WITH HIM. THE ACFT LEVELED OFF AT 3500 FT FOR SEVERAL MI. DUE TO HIS NOW LOST COM STATUS I DSNDED ANOTHER IFR ACFT TO REMAIN WELL CLR OF HIM WHILE THE HIGHER SECTOR KEPT ANOTHER ACFT AT 5000 FT. AT THIS TIME WE DID NOT KNOW IF THE PLT HAD DSNDED OR HAD A BAD MODE C READOUT. THE BE58 FINALLY CALLED AFTER SEVERAL MINS AND I ASKED HIS ALT. THE PLT STATED THAT HE WAS LEVEL AT 3500 FT AND STATED NOTHING ELSE. I THEN INFORMED THE PLT OF A POSSIBLE PLTDEV AND INSTRUCTED HIM TO CALL THE FACILITY AFTER LNDG (THE PLT WAS ENRTE TO DAB). NOTHING ELSE WAS SAID IN RELATION TO THE INCIDENT AND THE REST OF THE RTE OF FLT WAS UNEVENTFUL. AFTER CALLING THE FACILITY THE PLT INFORMED THE SUPVR THAT HE WAS EXPERIENCING A CATASTROPHIC ENG FAILURE AND WAS BUSY WITH DEALING WITH THE ISSUE AND WAS UNABLE TO TALK/RESPOND TO ATC. THE PLT STATED HE FELT IT WAS BETTER TO DSND TO A VFR ALT (3500 FT) WHILE HE WORKED ON HIS ISSUE AND TRYING TO DECIDE TO LAND AT EITHER ZZZ OR ZZZ1 (PLT WAS BTWN THOSE 2 ARPTS). THIS PLT AT NO TIME STATED HE WAS EXPERIENCING AN ENG PROB OR A POSSIBLE EMER. THE PLT AT NO TIME STATED THE NEED TO LAND AT A CLOSER ARPT BECAUSE OF HIS EMER AND IN FACT; CONTINUED ON TO ZZZ2 AND BYPASSED 2 CLOSER ARPTS. AFTER TALKING TO THE PLT THE SUPVR DECIDED THAT THE PLT DID NOT MEET THE REQUIREMENTS OF A PLTDEV AND THAT HE HAD GOOD CAUSE FOR HIS ACTIONS. NO PLTDEV WAS FILED ON THE MATTER.