<P> In the sixth - season finale, a gunman commits mass murder at the hospital . Mark helps Lexie save Alex, her new boyfriend . In the aftermath of the shooting, Lexie has a nervous breakdown and Mark has her committed to the psychiatric unit . Their friendship is strained, however Lexie softens towards him when she learns that he is still in love with her . As Lexie goes to talk to Mark about him still being in love with her, she sees Mark entering his apartment with Derek's sister Amelia kissing her and ultimately having sex with her . When Callie's girlfriend, pediatric surgeon Arizona Robbins (Jessica Capshaw), breaks up with her, she and Mark have a drunken one - night stand . Shortly thereafter, he reconciles with Lexie, but is delighted when Callie discovers she is pregnant with his child . Lexie, however, is dismayed by the news and leaves Mark . </P> <P> Mark asks Dr. Jackson Avery to find out how Lexie's doing, but Jackson lies to Mark that he wasn't able to find it out, and he (Jackson) starts dating Lexie shortly after that . In the meanwhile, Callie and Mark's daughter is born . Mark later gives Jackson and Lexie his blessing, and tells Lexie he will let her go; Lexie replies that she is still in love with him, but right now she needs Jackson to be happy . After giving Jackson a hard time, Mark finally acknowledges his surgery skills and decides to teach him, although he still evidences feelings towards Lexie, while he shows his own parenting skills with Sofia . He also starts getting along better with Arizona . After a long time without dating, Mark finally embarks on a relationship with Julia . This makes Lexie jealous, which leads to her and Jackson breaking up . Lexie struggles to tell Mark how she feels but finally admits it leaving him torn between her and Julia . In the season 8 finale, Mark, Lexie, Derek, Meredith, Cristina, and Arizona are involved in an aviation accident while on the way to Boise, Idaho to perform surgery on conjoined twins, crushing Lexie under debris . After trying and failing to save her, Mark holds a dying Lexie by the hand, telling her that he has and will always love her . He and the remaining surviving crash victims are left stranded in the woods, mourning Lexie and fighting to stay alive . </P> <P> In the ninth - season premiere, it is discovered that Mark is on life support due to the extensive injuries he sustained in the plane crash and, as determined by his will, the machines would be turned off if he showed no signs of waking within 30 days . Flashbacks of some moments in Mark's life showcased him being videotaped as he was extending his congratulations to newlyweds Callie and Arizona . At the end of the speech, he declares that Lexie was the one he wanted to grow old and dance with in their granddaughter's wedding . At 5: 00 that day, with Derek and Callie keeping vigil at his bedside, the machines were turned off, and Mark Sloan died shortly thereafter . The following episode reveals that he had a surge of good health upon his return to Seattle Grace before ultimately succumbing to his injuries . His' surge' allowed him enough energy to advise his protégé Jackson,' when you love someone, tell them', which is believed to be a reflection on the major obstacle of his failed relationship with Lexie . During this momentary energy, Mark also took the opportunity to make a clean break with his girlfriend, Julia, stating that the situation was not fair to her as he had always loved only Lexie . Following his death, Shonda Rhimes muses regarding Mark and Lexie's relationship:'...he and Lexie get to be together in a way . Their love remains true ." Seattle Grace Mercy West Hospital is later renamed Grey Sloan Memorial Hospital in tribute to Lexie and Mark . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (July 2011) </Td> </Tr> </Table>

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