Susan is one of ER 's original characters, first seen in Season 1 as an eager resident. She left County General Hospital and the series in Season 3, but returned five seasons later as an attending physician in Season 8. Susan Lewis eventually checked out of the ER for good in 2005 at the beginning of Season 12, having been passed over for tenure in favor of John Carter by Kerry Weaver. She was offered a tenured position at a hospital in Iowa. She returned in the final episode. Susan is left handed.
when does dr lewis come back to er
Season 8 the final episode