"Till Death Do Us Part" is the series finale of Pretty Little Liars, which premiered on the Freeform network in the United States on June 27, 2017.

Shortly after the two-hour final episode, a special titled "A-List Wrap Party" was aired, in which the main cast and King talked about the show's end and behind-the-scenes exclusives.

In the episode, the Liars finally discover the identity of their tormentor, as Spencer (Troian Bellisario) discovers she has an identical twin sister named Alex Drake, who is revealed to be the anonymous "A.D." wanting to avenge Charlotte's death and take over Spencer's life as an impersonator due to her jealousy of the life that her sister has.

Alex Drake's introduction and subsequent reveal as the series' final antagonist was met with a deeply polarizing response.

In 2018, one year after the events of "Farewell, My Lovely", Ezra and Aria are discussing their book and its soon-to-be film adaptation in the Warner Bros. Television backlot.

Now famous due to their book's worldwide success, they kiss and are photographed by a bunch of fans in a cart (staff writers of PLL in a group cameo).

The scene then jumps to the DiLaurentis house, where Emily and her high school sweetheart Alison are living a family life, taking care of the recently born Lily and Grace.

Hanna and Caleb leave Mona in the apartment to go to a surprise dinner planned by Spencer, who remodeled the Lost Woods Resort into a modern establishment.

Once Charlotte left, Alex soon came to Rosewood and learned about her half sister's fateful death which triggered her to become A.D. and also she was jealous of the life that Spencer lived.

She also posed as Spencer multiple times when she kissed Toby in "The Darkest Knight" and had sex with him in "Choose or Lose" and appeared to Hanna when she was being held by Alex in her dream sequence for confessing to killing Charlotte.

The Liars are seen in the town square exchanging goodbyes, as Aria prepares to leave for her honeymoon with Ezra and Hanna reveals that she is pregnant.

[2] 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.

[5] 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.

[6] 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.

[7][8] "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,[9] Torrey DeVitto as Melissa Hastings,[10] 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.

"[14] Carolina Preece of Den of Geek disliked the episode, but praised the show as a whole, writing, "At its best, Pretty Little Liars was a Taylor Swift song, a Hitchcock movie, a philosophy lecture and a soap opera all at once.

"[16] Yana Grebenyuk of TVFanatic echoes the same sentiments of praise, writing that "Alex delivered above and beyond what a Spencer twin could have actually turned out to be.