A PAX ACTING STRANGELY BECOMES NEARLY UNMANAGEABLE. AN EMER IS DECLARED; A DIVERSION TO A NEARBY ARPT ACCOMPLISHED; WHERE PAX IS REMOVED.

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ABOUT 1 HR AND 10 MINS INTO FLT; FLT ATTENDANT IN BACK OF CABIN CALLED TO RPT PAX WAS ACTING STRANGELY; PACING IN AISLE AND TALKING. HE WAS ALSO SAYING THAT HE NEEDED TO TALK TO SOMEONE. I ASKED FLT ATTENDANT TO GO AHEAD AND TALK TO PAX TO SEE WHAT HIS PROB WAS. AFTER ABOUT 5-10 MINS; FLT ATTENDANT CALLED BACK TO SAY PAX WAS ACTING EVEN STRANGER. PACING; ACTING SCARED; NERVOUS AND CONFUSED. SHE SAID SHE WAS ATTEMPTING TO TALK PAX BACK INTO HIS SEAT; BUT WASN'T HAVING ANY LUCK. SIT WAS DETERIORATING VERY RAPIDLY. I ASKED FLT ATTENDANT TO PAGE FOR A DOCTOR AND ALSO IDENT ABLE-BODIED MALE PAX; WHO WERE WILLING TO ASSIST IF NEEDED. IN THE MEANTIME; MY FO WAS INFORMING ATC OF OUR SIT AND PREPARING ATC FOR POSSIBLE DIVERT. I ALSO WAS IN CONTACT WITH MY COMPANY THROUGH MY DISPATCHER. THIS TIME WHEN FLT ATTENDANT CALLED BACK; SAID PAX WAS EVEN WORSE SAYING 'I DON'T WANT TO HURT ANYONE;' AND 'THIS FLT WILL NOT MAKE IT TO MEXICO CITY.' AT THIS POINT; FLT ATTENDANT FELT HER OPTIONS WERE RUNNING OUT AND SUGGESTED WE LAND ASAP. I INSTRUCTED HER TO ASK MALE VOLUNTEERS TO PHYSICALLY SEAT THE PAX; APPLY HANDCUFFS; AND RESTRAIN HIM WITH A SEATBELT. BY NOW; PAX HAD PARTIALLY DISROBED AND WAS IN THE AFT GALLEY. WE DECLARED AN EMER WITH ATC AND DIVERTED TO IND. FLT LANDED WITHOUT FURTHER INCIDENT. LCL; STATE; AND 'FEDS' TOOK OVER. PAX WAS REMOVED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK REVEALED THAT THE PAX HAD BEEN ACTING A LITTLE BIT STRANGE DURING BOARDING; BUT IT WAS NOT OF ANY CONCERN TO THOSE WHO OBSERVED HIM. AN ON BOARD DOCTOR; WHO HELPED WITH THE SIT; STATED THAT IT APPEARED TO BE A CASE OF SOMEONE WHO MAY HAVE MISSED HIS MEDICATION. AT ONE POINT; IT TOOK UP TO 8 MEN TO CTL THE INDIVIDUAL. THE ESCALATION OF THE INCIDENT TO A SERIOUS LEVEL ALL OCCURRED IN A VERY SHORT TIME.