B737 PURSER RPTED THAT A PAX BECAME VIOLENT DURING A FLT FROM MIA TO YUL.

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APPROX 1 1/2 HRS INTO THE FLT; I HEARD SHOUTING IN MAIN CABIN. PAX IN QUESTION WAS IN AN ALTERCATION WITH FLT ATTENDANT #4; VERY LOUD; SCREAMING AT THE TOP OF HIS LUNGS. I STAYED IN FIRST CLASS BECAUSE I WAS WORRIED THIS MIGHT BE A DIVERSION. FLT ATTENDANT #3 TRIED TO INTERVENE TO DIFFUSE SIT. PAX THREW A PRETTY HVY MAGAZINE AT HER. IT HIT HER AT THE CORNER OF HER EYE. CAPT WAS INFORMED DURING THIS ALTERCATION. PAX WAS ADVISED IF HIS BEHAVIOR CONTINUED; WE WOULD DIVERT AND LAND. BECAUSE HE PHYSICALLY THREATENED AND ASSAULTED FLT ATTENDANT #3; THE DECISION WAS TAKEN TO HAVE AUTHS MEET THE FLT. DURING QUESTIONING; IT BECAME KNOWN THAT PAX HAD BEEN ASSAULTED; ROBBED; BEATEN IN MEXICO CITY. ALL HIS BELONGINGS HAD BEEN STOLEN. THAT MAY HAVE EXPLAINED HIS DISHEVELED APPEARANCE. HE WAS DIRTY AND SMELLY; CARRIED A FEW PLASTIC GROCERY BAGS WITH A FEW PERSONAL BELONGINGS. IT WAS ALSO APPARENT THAT HE MIGHT HAVE BEEN MENTALLY CHALLENGED SO FLT ATTENDANT #3 MADE THE DECISION NOT TO PRESS CHARGES; BUT PAX HAS BEEN BLACK LISTED ON OUR CARRIER. MY PERSONAL FEELING IS THAT FLT ATTENDANT #4 MAY HAVE PROVOKED PAX BY MAKING A COMMENT ABOUT PAX'S SMELLY FEET; LOUD ENOUGH TO BE OVERHEARD BY PAX SITTING AROUND HIM. WHILE SPEAKING TO SEVERAL PAX WHO WERE WILLING TO BE NAMED; WE WERE TOLD THAT THIS PAX HAD CAUSED A COMMOTION IN THE DEP LOUNGE PRIOR TO BOARDING; BEHAVING ERRATICALLY; SPEAKING TO HIMSELF; ETC. GATE AGENT APPARENTLY IGNORED THIS.