the last someone heard/saw of someone/something idiom
C2 最后一次听到有关（某人或某事）的任何消息；最后一次见到他／她／它
the last time someone heard anything about someone or something or the last time someone saw him, her, or it
Then he went to Boston, and that was the last I saw of him. 然后他就去了波士顿，那是我最后一次见到他。