Nathan Riggs, M.D., F.A.C.S., is a fictional character from the medical drama television series Grey's Anatomy, which airs on the American Broadcasting Company (ABC) in the United States.
He was introduced in the Season 12 episode "The Me Nobody Knows" as a cardiothoracic surgeon who had worked overseas with April Kepner (Sarah Drew) during her time in Jordan.
After bringing a patient to Grey-Sloan Memorial, Riggs begins working there as an attending under Maggie Pierce (Kelly McCreary), the Chief of Cardiothoracic Surgery.
While at the hospital, Nathan develops a romantic relationship with Meredith Grey (Ellen Pompeo), who is grieving the loss of her husband, Derek Shepherd (Patrick Dempsey).
Their relationship becomes complicated when Nathan's long-missing fiancée, Megan Hunt (Abigail Spencer), is found alive and brought back home.
Nathan Riggs is introduced in the sixth episode of Grey's Anatomy's twelfth season, "The Me Nobody Knows", as a new cardiothoracic attending at Grey-Sloan Memorial Hospital.
The cause of their feud is eventually disclosed: Owen’s sister, Megan Hunt (Abigail Spencer), who had been engaged to Nathan, discovered his infidelity before running off and being kidnapped.
Nathan makes his final appearance in the Season 14 episode "Danger Zone", marking the departure of actor Martin Henderson from the series.
Shonda Rhimes announced Henderson’s exit via Twitter, stating, "I loved that we were able to give Riggs a happy ending worthy of his character and talent.