Grand Theft Auto III

It is believed that he shot Maria, on the count of she was being her total spas self. Plus she was the only person in that last scene with Claude, so Claude shooting Maria makes the most sense.

However, the guys at Rockstar North know how to pull a prank and it is also believed that they put in the shot as a cliffhanger, or in a simpler term, just for the heck of it.

So there you go. The real answer is... there is no real answer. You draw the conclusion on your own. Like I said, the most logical theory would be that he shot Maria, since she finally shuts up after the shot is heard. There's also no evidence as of yet to prove this theory wrong, so it's the easiest direction to step in. However, the shot could've been put in by the developers just to screw with your mind a little.

You draw the conclusion.

He could easily just have shot skywards, just to shock Maria into shutting the hell up.

PLAY GTA 4. ITs AWESOME.