Question: Which Irish actor played the main role in a screenplay based on British author E.J James' book as well as played serial killer Paul Spector?
Context: "Dexter", or "Pilot", is the pilot episode of the first season television drama series "Dexter", which premiered on October 1, 2006 on Showtime in the United States.  The episode was written by developer James Manos, Jr. and directed by Michael Cuesta.  It was based on the opening of the novel "Darkly Dreaming Dexter" by Jeff Lindsay.  The pilot introduces the series' protagonist, Dexter Morgan (Michael C. Hall), a Miami Metro Police Department blood spatter analyst with a double life as a serial killer.  While solving murders in the Homicide division, Dexter also spends his time hunting and killing murderers and criminals who have escaped the justice system.  The pilot introduces the "Ice Truck Killer", a serial killer who targets prostitutes and leaves their bodies dismembered and bloodless, and the rivalry that develops between the killer and Dexter. The Fall is a British-Irish crime drama television series filmed and set in Northern Ireland.  The series is created and written by Allan Cubitt, produced by Artists Studio, and shown on RTÉ One in the Republic of Ireland and BBC Two in the UK.  It stars Gillian Anderson as DSI Stella Gibson and Jamie Dornan as serial killer Paul Spector. James "Jamie" Dornan (born 1 May 1982) is an Northern Irish actor, model, and musician.  He played Axel von Fersen in Sofia Coppola's "Marie Antoinette" (2006), Sheriff Graham Humbert in the ABC series "Once Upon a Time" (2011–2013), serial killer Paul Spector in the BBC Two and RTÉ One crime drama series "The Fall" (2013–2016), and Christian Grey in the "Fifty Shades" franchise (2015–present). Fifty Shades of Grey is a 2015 American erotic romantic drama film directed by Sam Taylor-Johnson, with a screenplay by Kelly Marcel.  The film is based on the eponymous 2011 novel by British author E. L. James and stars Dakota Johnson as Anastasia Steele, a college graduate who begins a sadomasochistic relationship with young business magnate Christian Grey, played by Jamie Dornan. Jonathan Michael Paul Spector (born March 1, 1986) is an American soccer player who plays as a defender for Orlando City and the United States national team.  He started his professional career in England when he was signed by Manchester United as a teenager, but rarely appeared for the club.  He played on loan at Charlton Athletic, then in 2006 joined West Ham United, for whom he played over 100 games before he was released at the end of the 2010–11 season.  He then spent five-and-a-half seasons with Birmingham City. Cold North Killers: Canadian Serial Murder is a 2012 Canadian non-fiction book written by Lee Mellor and published by Dundurn Press.  It documents the lives of sixty Canadian serial killers, with the earliest being Edward H. Rulloff and the most recent being Russell Williams.  The book uses Katherine Ramsland's interpretation of what constitutes a serial killer—someone who has killed at least two people on two separate occasions, and who attempted to or likely would have killed again—as outlined in her 2007 book "The Human Predator".  "Cold North Killer's" own definition of what constitutes a Canadian serial killer includes both Canadians who committed murder abroad (such as Keith Hunter Jesperson and Gordon Stewart Northcott) and non-Canadians who committed murder in Canada (like William Dean Christenson and Earle Nelson). The Sun Hill Serial Killer was a major storyline from ITV's cop show "The Bill".  Known originally as the "River Murders", the storyline spanned several months in 2002 and served as the exit for popular cast regular Cass Rickman (played by Suzanne Maddock).  It was the first of several serial killer storylines from the show.  Events came to a head in the New Year of 2003, when Acting DI Samantha Nixon discovers the truth and is taken hostage by the serial killer, before a final confrontation in which she is overpowered by DC Duncan Lennox, charged and thrown into the cells at Sun Hill Station. The Bourbon Kid series is a horror/thriller series by an anonymous British author.  The series began with "The Book With No Name", which was originally published in 2006 through Lulu.com, but has since been re-released through Michael O'Mara Books.  The books center on a supernatural serial killer only known as the "Bourbon Kid".  The first book in the series was initially written with the intent to make it a Western novel, with the author choosing to move the series to present day partway through the book. "The Fall" is a British-Irish crime drama television series filmed and set in Northern Ireland.  The series is produced by Artists Studio and created by Allan Cubitt.  It premiered in the Republic of Ireland on RTÉ at 9:30 pm on 12 May 2013, and in the United Kingdom on BBC Two at 9:00 pm on 13 May 2013.  The series stars Gillian Anderson as DSI Stella Gibson, a senior Metropolitan Police Detective and Jamie Dornan as serial killer Paul Spector. Luis Alfredo Garavito Cubillos, also known as "La Bestia" ("The Beast") or "Tribilín" (named after Disney character "Goofy"'s Latin American Spanish name) is a Colombian rapist and serial killer.  In 1999, he admitted to the rape, torture and murder of 147 young boys.  His victims, based on the locations of skeletons listed on maps that Garavito drew in prison, could eventually exceed 300; Garavito continues to confess to more murders.  He has been described by local media as "the world's worst serial killer".  According to the Attorney General's Office and various judicial bodies, Luis Alfredo Garavito is the "second serial killer of the world."  Likewise, the judicial body ruled that all Garavito's sentences total 1853 years and nine days in jail.
Answer: Jamie Dornan