Pigsy is the antagonist found in the slaughterhouse, pigsy is stuck to the wall until released . When released pigsy will grab his chainsaw and murder the player and the family. Im not entirely sure , but i think Pigsy is a reference to Piggsy ( Manhunt ) or inspired by him. Spoiler alert!!!
At the end when you drive the van out of the gate , Pigsy chases the van at inescapable speed , and proceeds to maul each player, that is the inevitable end to the game.