After briefly reviving a young mother (Rachel Singer) dying of cancer so that the woman can bid goodbye to her family, head nurse Carol Hathaway (Julianna Margulies) suddenly realizes that her own life is figuratively slipping away. Determined to live the rest of her existence to the fullest, Carol leaves County General for good, heading to Seattle for what she hopes will be a romantic reunion with another ER alumnus. Meanwhile, Chen (Ming-Na) is worried about Carter's (Noah Wyle) precarious mental condition; and after attending his father's funeral, Greene (Anthony Edwards) tries to mend fences with his estranged daughter (Yvonne Zima). The ending of "Such Sweet Sorrow" was one of the best-kept secrets of the 1999-2000 TV season -- and on the off-chance that the reader hasn't seen the episode, it would be unfair to spoil the surprise here.
by Hal Erickson synopsis