>>31437785The Ice King could no longer stand how Finn and Jake were abusing their relationship with the Princesses.
So, he took a gun from the evidence room and stole the Princesses from them. He got into a car filled with all the Princesses he had, as well as his Penguin, and drove away, heading to the Canadian border, with a bag of evidence room cocaine to keep him awake.
He didn't make it, so he shot himself.
His Penguin, renamed Ice King, as adopted by a someone from the station.