1.   But five months later, Skilling resigned.

2.   In mid-August, Skilling resigned.

3.   Kenneth Lay, the chairman, keeps the title of CEO, which he took back when Skilling resigned.

4.   Eight months later Skilling abruptly resigned, citing personal reasons.

5.   Enron stock dropped when Skilling abruptly resigned.

6.   Skilling resigned in August.