notice that their leader, Addison Derringer, is missing. The episode ends with a girl named Willa revealing to Hadley, "I think I heard her scream". Development The story was drafted by series creator I. Marlene King and Kyle Bown, while its teleplay was composed by King and executive producer Maya Goldsmith. This is the only season finale not entirely written solely by King. The episode was aired as a two-hour special event. Directed by King, it was filmed in October 2016 in and around Los Angeles, California, mostly on the backlot of the Warner Bros. studio lot in Burbank. Filming started in October 5 and wrapped in October 26, marking it the last day of filming for Pretty Little Liars ever. Scenes at the set for the fictional Lost Woods Resort were filmed. On August 29, 2016, King and the principal cast of the series announced that Pretty Little Liars was ending after the seventh season. King also announced that it would start airing the second half of the season later than usual, in April 2017 and that the series finale would be a two-hour episode event. On October 26, 2016, it was reported that a tell-all special would be aired after the series finale, during which the main cast members and King would talk about the show with behind-the-scenes exclusives. Casting "Till Death Do Us Part" saw the return of several past recurring characters, including Holly Marie Combs and Chad Lowe as Ella and Byron Montgomery, Mary Page Keller as Dianne Fitzgerald, Torrey DeVitto as Melissa Hastings, Julian Morris as Wren Kingston, Keegan Allen as Toby Cavanaugh, Lesley Fera as Veronica Hastings, Vanessa Ray as Charlotte Drake, Brendan Robinson as Lucas Gottesman, Huw Collins as Archer Dunhill, Jim Titus as Barry Maple, Ava Allan as Addison Derringer, Tammin Sursok as Jenna Marshall, and Nia Peeples as Pam Fields. The episode also features Sydney Sweeney as Willa, Celesse Rivera as Hadley St. Germain, Raquel McPeek as Claire, and Dalton Cyr as Luke. Showrunner I. Marlene King, her wife Shari Rosenthal, and their sons Atticus and Emerson have cameo roles in the episode. Reception Critical response Jessica Goldstein of Vulture gave the episode a 3 out of 5 stars rating, writing a mixed review for it. Gavin Hetherington highlighted some lines of the episode, praising Mona's triumph over "A.D.", commenting: "Mona hasn't really changed in her obsession with playing with dolls