Please, would you tell me if I written correctly the following sentences:

1. The doctors were unable to save the life of a man who had drowned in the river.
2.The old woman was violently attacked by a young criminal, who had escaped from the prison the same day.
3. As long as he lives, he would never forget the words which his father told him on his deathbed.
4.Peter had a terrible shock, which changed his life for ever.