At the advent of his 40th birthday, Don's fairy-tale marriage to Megan hits a few roadblocks, and he suffers from hallucinations after the gang finds Lane Pryce hanging at the office. Though his visions then centre around his late brother (who hanged himself as well), he also has a fever dream in which he kills a former lover. The season ends with Don at a bar with a woman cosied up to him, asking if he's alone.
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