A B767 DIVERTED TO REMOVE AN UNRULY AND UNCTLABLE PAX.

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I WAS WORKING COACH CABIN (FLT ATTENDANT #3). I PULLED TICKETS AT TERMINAL DOOR. PAX WAS LAST TO BOARD. HE BOARDED ABOUT 5 MINS BEFORE DEP. AS I BOARDED ACFT; I WAS INFORMED BY FLT ATTENDANT #6 THAT THE PAX WAS TO BE GIVEN NO ALCOHOL DURING FLT AS HE APPEARED INTOXICATED; OR MENTALLY UNBALANCED TO THE FLT ATTENDANTS ON BOARD. I WAS TOLD GND PAX SVC AGENT CAME ON THE ACFT AND TOLD HIM HE WOULD NOT BE SERVED ALCOHOL. AFTER TKOF; HE REPEATEDLY ASKED THE OTHER FLT ATTENDANTS FOR A DRINK. HE ASKED ME ONLY ONCE; BUT TOLD ME HE WAS SCHIZOPHRENIC AND THAT HE WAS NERVOUS AND REALLY NEEDED A DRINK. I TRIED TO DETER HIS ATTN FROM ASKING FOR A DRINK BY ASKING HIM WHY HE WAS TRAVELING. HE SAID HE WAS ON A HOLIDAY IN THE STATES AND WAS VISITING HIS BROTHER OUTSIDE OF PALM SPRINGS; AND THAT NOW HE WAS ON HIS WAY HOME. HE APPEARED TO BE 'NORMAL' AT TIMES AND ANGRY AT OTHERS. I WAS AWARE THAT HE HAD ASKED TO SEE THE CAPT. HE HAD MOST CONTACT WITH FLT ATTENDANT #6. FLT ATTENDANT #6 KEPT THE #1 FLT ATTENDANT AND THE COCKPIT CREWS ABREAST OF THE SIT. THE CAPT; AS WELL AS THE PURSER (FLT ATTENDANT #1) BOTH CAME TO THE AFT CABIN TO TALK TO PAX. ALL OF THIS HAPPENED WITHIN THE FIRST 1 1/2 HRS OF THE FLT. I WAS INFORMED THAT WE WERE GOING TO DIVERT TO JFK TO DEPLANE THIS PAX AS WE BEGAN THE MEAL SVC. UPON ADVANCING UP THE AISLE WITH A MEAL CART; THE PAX CLUTCHED ONTO THE CART SO I COULDN'T GO UP THE AISLE. HE ASKED SOMETHING ABOUT THE CAPT BUT WAS DIFFICULT TO UNDERSTAND. I TOLD HIM I HAD NO INFO ABOUT WHAT WAS TO HAPPEN. ONCE IN THE AISLE WITH THE BEVERAGE AND MEAL CARTS; HE APCHED ME AGAIN. THE FLT ATTENDANT ON THE BEVERAGE CART FIRMLY TOLD HIM TO GO BACK TO HIS SEAT. I WAS SOMEWHAT (#6) CONCERNED THAT HE WAS BACK IN THE AFT PART OF THE CABIN WITHOUT A CREW MEMBER PRESENT. HE REPEATEDLY WENT TO LAVATORY. WE FINISHED SVCS; LANDED AT JFK; AND AUTHS ESCORTED PAX OFF ACFT.