thats exactly why i watch ganster films over and over till i know it verbatim....the guy who kills tony in the end is teh same guy who killed omar suarez at sosa's house when tony looks through the binoculars at the helicoptor....he was also at the table as one of sosa's bodygaurds.....then when omar is leaving the assasin of the un guy who tony kills and the guy with the shades leave with him so the stroy that i gather is that they were sosa's main assasins and security men...and i guess they have the guy with the shdaes kill tony for two reasons...one to show that it took sosa's main and primary hit man to kill him and also that he was getting revenge for his friend who tony killed for tryning to blow up"a innocent woman an two kids"...cuz if u see in the helicopter he's really violent and beating an cursing and shaking omar before he throws him out but when and after he kills tony he seems so controlled ...i dunno but if u gat any other ideas lemme know