In the 2 parter in the final season, Albert is addicted to morphine, and is rescued by Charles, and brought to Walnut Grove.
He recovers, and in the voiceover at the end, Laura says that he left Walnut Grove after that, but returned in the future, as Walnut Grove's doctor.
He recovers, and in the voiceover at the end, Laura says that he left Walnut Grove after that, but returned in the future, as Walnut Grove's doctor.