Title: Once Upon a Time (season 6)
Content: Beverley Elliott as Widow Lucas / Granny ; Raphael Sbarge as Jiminy Cricket / Dr. Archie Hopper ; Lee Arenberg as Dreamy / Grumpy / Leroy ; David Paul Grove as Doc ; Gabe Khouth as Sneezy / Mr. Clark ; Faustino Di Bauda as Sleepy / Walter ; Mig Macario as Bashful ; Geoff Gustafson as Stealthy ; Tony Amendola as Mister Geppetto / Marco ; Keegan Connor Tracy as the Blue Fairy / Mother Superior ; Eion Bailey as Pinocchio / August Booth ; David Anders as Victor Frankenstein / Dr. Whale ; Jessy Schram as Cinderella / Ashley Boyd ; Tim Phillipps as Prince Thomas / Sean Herman ; Gabrielle Rose as Ruth ; Alan Dale as King 
Title: Once Upon a Time (season 6)
Content:  also marks the final season of Emma Swan (Jennifer Morrison) as a series regular. Morrison announced she would be departing the series after the sixth season finale, but would make two guest appearances in the next season, including the series finale. After serving as a series regular for two seasons, Rebecca Mader also announced that season six would be her last on the show as a regular. Shortly after, Adam Horowitz and Edward Kitsis announced that original cast members Ginnifer Goodwin, Josh Dallas, and Jared Gilmore, as well as Emilie de Ravin who joined the main cast in season two, would also exit the show at the end of the season. All would make at least one appearance the following season.
Title: Once Upon a Time (season 6)
Content:  / Albert Spencer ; Jaime Murray as Fiona / the Black Fairy ; Giles Matthey as Gideon / Morpheus ; Sean Maguire as Robin Hood ; Tony Perez as Prince Henry ; Rose McIver as Tinker Bell ; JoAnna Garcia as Ariel ; Gil McKinney as Prince Eric ; Giancarlo Esposito as Magic Mirror / Sidney Glass ; Chris Gauthier as Mr. Smee ; Hank Harris as Dr. Henry Jekyll ; Sam Witwer as Mr. Hyde ; Deniz Akdeniz as Aladdin ; Karen David as Jasmine ; Olivia Steele Falconer as Violet ; Tzi Ma as the Dragon ; Patrick Fischler as Isaac Heller ; Sara Tomko as Tiger Lily ; Wil Traval as the Sheriff of Nottingham / Keith 
Title: Once Upon a Time (season 6)
Content:  declined an offer to remain on the show and that the sixth season would be her last, signaling the end of Emma's time on the show as the main protagonist. On May 11, Rebecca Mader announced that she would also be leaving the show at the end of the season, citing creative decisions beyond her control. On May 12, season six was announced to be the last for four additional main actors: Ginnifer Goodwin, Josh Dallas, Jared Gilmore, and Emilie de Ravin. The season finale revealed that Henry Mills will remain a series protagonist, with the setting shifting to a later time period in which he is portrayed as an adult by Andrew J. West.
Title: Once Upon a Time (season 6)
Content:  Emilie de Ravin told fans that she will be returning for the sixth season. It was also announced later that Hank Harris and Sam Witwer signed contracts to play two new recurring characters on the sixth season of the show, later revealed to be Dr. Jekyll and Mr. Hyde respectively. On March 29, 2016, Lana Parrilla confirmed she would be returning for the sixth season. Robert Carlyle was confirmed to be returning for the sixth season as Rumplestiltskin along with Rebecca Mader as Zelena and Jared Gilmore as Henry Mills. It was announced that Giles Matthey was cast as Morpheus, who was slated to appear in the first episode of 
Title: Once Upon a Time (season 6)
Content: Ginnifer Goodwin as Snow White / Mary Margaret Blanchard ; Jennifer Morrison as Emma Swan ; Lana Parrilla as Evil Queen / Regina Mills ; Josh Dallas as Prince Charming / David Nolan ; Emilie de Ravin as Belle French ; Colin O'Donoghue as Captain Hook / Killian Jones ; Jared S. Gilmore as Henry Mills ; Rebecca Mader as Wicked Witch of the West / Zelena ; Robert Carlyle as Rumplestiltskin / Mr. Gold 
Title: Once Upon a Time (season 6)
Content:  The sixth season of the American ABC fantasy-drama Once Upon a Time was ordered on March 3, 2016. It debuted on September 25, 2016, and concluded on May 14, 2017. In January 2017, it was stated that the sixth season would end the main storyline, and for a seventh season, the series would be softly rebooted with a new storyline. Existing fictional characters introduced to the series during the season include Aladdin, Princess Jasmine, the Count of Monte Cristo, Captain Nemo, Lady Tremaine, Beowulf, Tiger Lily and the Tin Man. Original new characters include Gideon, the Black Fairy, Mary Lydgate, and Robert. The show also reintroduced Jafar and Dr. Arthur Lydgate, who previously appeared in Once Upon a Time in Wonderland. This 
Title: Once Upon a Time (season 6)
Content:  as Jack ; Tammy Gillis as Jill ; Mckenna Grace as young Emma ; Rustin Gresiuk as teen August / Pinocchio ; Jack Davies as young Pinocchio ; David Cubitt as Robert ; Tara Wilson as young Ruth ; Luke Roessler as young David / young James ; Brandon Spink as young Baelfire ; Torstein Bjørklund as Beowulf ; Zahf Paroo as Prince Achmed ; Charles Mesure as Blackbeard ; Anton Starkman as young Gideon ; Grayson Gabriel as Roderick ; Mason McKenzie as young Roderick ; Isabella Blake-Thomas as young Zelena ; Alex Désert as Stanum / Tin Man ; Austin Obiajunwa as young Stanum ; Stephen Lord as Malcolm ; Andrew J. West as adult Henry Mills ; Alison Fernandez as Lucy 
Title: Once Upon a Time (season 6)
Content:  a contract to appear in one episode in season 7. On May 12, 2017, showrunners Horowitz and Kitsis confirmed that five more cast members, in addition to Morrison, would not be returning to the show for a seventh season: Ginnifer Goodwin, Josh Dallas, Jared Gilmore, Emilie de Ravin, and Rebecca Mader. In their personal goodbyes to fans, both de Ravin and Mader cited the show's decision to move forward in a new creative direction as the reason for their departures. Gilmore expressed similar sentiments. Meanwhile, Goodwin and Dallas had informed the showrunners a year prior that they intended to leave the show at the end of the sixth season.
Title: Once Upon a Time (season 6)
Content:  The former main character, who died on-screen near the end of season 5, will not be brought back from the dead but would appear in a multi-episode arc in a different capacity. For the second half of the season, Wil Traval would be returning for multiple episodes, starting in episode 11, as the Sheriff of Nottingham. On October 31, it was announced that Mckenna Grace would be returning as a younger version of Emma. On December 11, Robert Carlyle revealed that Brandon Spink would be portraying a young Baelfire in episode 13. On January 6, 2017, it was announced that JoAnna Garcia would be returning as Ariel. The story 

Question: who dies in season 6 of once upon a time?
Answer: Hyde.
Jekyll.