Whats the ruling here?

[RRRRICK]

Playing in a home cash game and the end of the night we all cahed out and 6 players agreed to playing a NL Holdem Tourney to finish of the night. Anyway a short stacked player goes all in pre flop and two players call. Unwitting the all in player turns over his cards not considering that the two callers can still play a side pot(irrespective on whether or not this would actually happen). No one really knew what the correct course of action should be here. Some suggested that the hand was dead and others suggested that once he had exposed his hand that the callers shouls also expose and play the hand out. After about five minutes of discusson we decided to return each players chips and move on. This probably worked out well for the all in player as he held KQo against 88 and AKs.