Who was the lookout on the night of the disaster who first saw the iceberg and gave the warning?

Frederick Fleet. He was on the last half hour of his watch when he spotted the iceberg.
He was survived and was on lifeboat #6

This message has been edited. Last edited by: DorianGreyed,

Correct!
Frederick Fleet died on January 10th, 1965 after taking his own life. He had been suffering from depression after his wife's death two weeks before.