When the king was on his deathbed in 1087, he ordered that Morcar should be released, in common with others whom he had kept in prison in England and Normandy, on condition that they took an oath not to disturb the peace in either land. He was not long out of prison, for William Rufus took him to England, and on arriving at Winchester put him in prison there. Nothing further is known about him, and it is therefore probable that he died in prison.