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Walsh will star in multiple episodes, but it is unclear what role she will play in the upcoming season. Dr. Montgomery first appeared in the season 1 finale of \"Grey's,\" iconically introducing herself as the wife of Patrick Dempsey's Derek Shepherd before telling Pompeo's Meredith Grey, \"And you must be the woman who's been screwing my husband.\"

Walsh departed after \"Grey's\" third season to star on \"Private Practice,\" which ran for six seasons.

In May, ABC Audio caught up with Walsh and asked if she'd ever return to \"Grey's\" following the surprise return of Dempsey, T.R. Knight and Chyler Leigh during the 17th season.

Saying at the time she \"honestly would\" come back to the franchise if asked, the actress added she \"doesn't know\" if the character she spent nearly a decade bringing to life could make a grand return, confessing, \"No one's reached out.\"

Added Walsh, \"There was talk a long time ago of me going back ... but it was conflicted with the shooting of Umbrella Academy, so I couldn't do it.\"

The show's 18th season premieres Sept. 30 on ABC.

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