"Who shot J.R.?"
 is an advertising catchphrase that American network CBS created in 1980 to promote the television series "Dallas".
 It referred to the mystery surrounding a murder attempt against the character J.R. Ewing in "A House Divided", the show's third-season finale.
 The mystery was not resolved until the fourth episode of the fourth season, "Who Done It", which aired eight months later.
Omar Avila is a Cuban-American actor who appeared in the films "Once Upon A Wedding" and "The Punisher".
 He grew up in Miami and got his big break in the Telemundo series "Los Teens".
 He has appeared in several telenovelas, including "Soñar No Cuesta Nada" and "Watch Over Me".
 He also played Esteban Hernández in the third-season finale of "House" and Carlos in "Cleaners".
 In an interview he told about his interest to make a movie in his born country.
Jay Faerber (born 1972) is an American comic book and television writer.
 Faerber is known for his work on "Generation X" and "New Warriors" for Marvel Comics, and "The Titans" and "" for DC Comics.
 He later wrote his own creator-owned titles for Image Comics, including "Noble Causes", "Dynamo 5", "Near Death" and "Copperhead".
 He was also a writer on the CW TV series "Ringer" and "Star-Crossed" and currently writes for the CBS TV series Zoo.
"No Rest for the Wicked" is the third-season finale of The CW television series "Supernatural".
 It is the sixteenth episode of the third season, and is the show's sixtieth episode overall.
 Written by series creator Eric Kripke and directed by Kim Manners, the episode was first broadcast on May 15, 2008.
 The narrative follows the series' protagonists Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles)—brothers who travel the continental United States hunting supernatural creatures—as they attempt to save the latter's soul from damnation.
 Having made a year-long demonic pact in the previous season finale, Dean has just one day left to live.
 The brothers must track down the demonic overlord Lilith, who holds Dean's contract.
 Lilith, meanwhile, is entertaining herself by possessing a young girl (Sierra McCormick) and terrorizing her family, a homage to the "Twilight Zone" episode "It's a Good Life".
Charmed is an American television series created by Constance M. Burge and produced by Aaron Spelling and his production company Spelling Television, with Brad Kern serving as showrunner.
 The series was originally broadcast by The WB for eight seasons from October 7, 1998, until May 21, 2006.
 The series narrative follows a trio of sisters, known as The Charmed Ones, the most powerful good witches of all time, who use their combined "Power of Three" to protect innocent lives from evil beings such as demons and warlocks.
 Each sister possesses unique magical powers that grow and evolve, while they attempt to maintain normal lives in modern-day San Francisco.
 Keeping their supernatural identities separate and secret from their ordinary lives often becomes a challenge for them, with the exposure of magic having far-reaching consequences on their various relationships and resulting in a number of police and FBI investigations throughout the series.
 The series initially focuses on the three Halliwell sisters, Prue (Shannen Doherty), Piper (Holly Marie Combs) and Phoebe (Alyssa Milano).
 However, following Prue's death in the third-season finale, their long-lost half sister Paige Matthews (Rose McGowan) assumes her place within the "Power of Three" from season four onwards.
William James Remar (born December 31, 1953), is an American actor and voice actor.
 He played Richard, the on-off tycoon boyfriend of Kim Cattrall's character in "Sex and the City", Ajax in "The Warriors" (1979), homicidal maniac Albert Ganz in the thriller "48 Hrs.
" (1982), gangster Dutch Schultz in "The Cotton Club" (1984), Lord Raiden in "" (1997), Giuseppe Salvatore in The CW TV series "The Vampire Diaries", Jack Duff in "Miracle on 34th Street" (1994), and Harry Morgan in the Showtime TV series "Dexter".
 Since 2009, he has done voiceover work in ads for Lexus luxury cars.
 James Remar also studied acting at The Neighborhood Playhouse School of the Theatre in New York City.
"Stay" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012).
 It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013.
 "Stay" was co-written by Ekko and Justin Parker.
 The song's lyrical content speaks of temptation and the inability to resist true love.
 Music critics were generally positive in their opinion regarding the balladry, with most describing it as a standout track on the album, though a few labeled it as boring.
 The song was featured on the third-season finale of the TV Show Younger.
"Penny Dreadful" is a British-American horror drama television series created and written by John Logan, who serves as executive producer alongside Sam Mendes.
 The title refers to the penny dreadfuls, a type of 19th-century cheap British fiction publication with lurid and sensational subject matter.
 The series premiered on Showtime on May 11, 2014.
 After the third-season finale on June 19, 2016, series creator John Logan announced that "Penny Dreadful" had ended.
 During the course of the series, episodes of "Penny Dreadful " aired over seasons.
Cynthia Addai-Robinson (born January 12, 1985) is an American actress.
 She is best known for her roles as Naevia in the Starz television series "Spartacus" and DC Comics character Amanda Waller in The CW TV series "Arrow".
 Since November 2016, she plays the role of Nadine Memphis on the USA Network series "Shooter".
Sierra McCormick (born October 28, 1997) is an American actress.
 She is known for her role as Olive Doyle on the Disney Channel series "A.N.T. Farm" and her participation on the game show "Are You Smarter Than a 5th Grader?
" She also played Lilith on The CW television series "Supernatural".

Question: Actress Sierra McCormick played what character in the third-season finale of the CW tv series "Supernatural"?
Answer: Lilith