In the end who's that reloading the gun?

The guy in the cutscene? He's supposed to be one of the cloned assassins (Mark Purayah Jr. or Mark Parchezzhi III) but I think its only ever speculated on - I don't think its ever been confirmed. But then, who else would it be?

Its just a cop.. he shoots 47 starting the Contracts story line.

Agent 47 -- master assassin -- gets shot by a cop? Wasn't 47 surprised by the fact that his attempted killer knew him? How would a regular cop even know 47 existed, let alone get close enough to nearly kill him?

Also, the gun in the cutscene appears to be the same one carried by Mark Parchezzhi III on Amendment XXV (a Colt 1911).

The two targets in this mission are the targets from the final mission in "Contracts" (although the Opera singer has a different name, no clue why.) Anyway this has led many to speculate, or IO may have confirmed that the guy reloading the gun is the Cop who is the final target in the last mission, Chief of Police or something, I believe 47 provides a running backstory as to how the guy knew he was there, but I can't remember that well.