what should be done in this situation?

[originalpw]

4 players in the hand

pre flop

A- raises 200
B- goes all in for 800
C- goes all in for 1100
D - call 1100 (has chips left)

A- calls the extra 900 ( also still has chips)

A, not realizing that D still has chips left, thinks everyone was all in and shows his cards.(AA)

what should be done, is his hand mucked?

[crack]

It depends really on the rules of the place, but if it's between friends, I'd be more inclined to just cap the pot there and have a 4 way all in, meaning A and D can't put any more chips in.

[lwestatbus]

I saw this situation on one of the televised tournys (either a WSOP Circuit or WPT) and I think what happened was that the hand continued but the player who didn't show had the extra information. I wouldn't lay money that I remember this correctly but that was the immediate recollection that came to mind.