Question: What was the nationality of the "Lonely Hearts Killers"?

Passages:
Sgt. Petsound's Lonely Hearts Club Band is a track-for-track mash-up of The Beach Boys’ "Pet Sounds" with The Beatles’ "Sgt. Pepper's Lonely Hearts Club Band" by Clayton Counts, posted on his blog.  It was released under the pseudonym "The Beachles" and received favorable mentions in "Entertainment Weekly" and "USA Today", as well as blogs around the world.  Sometime around September 8, 2006, Counts received a cease and desist order from EMI's attorneys.  Notably, the letter included a demand for Counts to hand over the IP addresses of everyone who downloaded or streamed the songs.  Counts removed the songs, but refused to give up the IPs and fired back with a lengthy missive on his blog.  The incident drew the attention of the Associated Press and "Rolling Stone", and resulted in a letter-writing campaign and a boycott of EMI and Capitol Records on behalf of Mr. Counts. Deep Crimson (Spanish: Profundo Carmesí ) is a 1996 Mexican crime film directed by Arturo Ripstein, written by Paz Alicia Garciadiego and starring Regina Orozco and Daniel Giménez Cacho.  Like "The Honeymoon Killers" before it, the film is a dramatization of the story of "Lonely Hearts Killers", Raymond Fernandez and Martha Beck, who committed a string of murders of women in the 1940s. Easy Star's Lonely Hearts Dub Band is a dub reggae tribute to the Beatles' album "Sgt. Pepper's Lonely Hearts Club Band", by the Easy Star All-Stars.  It was released on April 14, 2009. The phrase lonely hearts killer, sometimes also want-ad killer or matrimonial bureau murderer, is a journalistic term of art that refers to a person who commits murder by contacting a victim who has either posted advertisements to or answered advertisements via newspaper classified ads and personal or lonely hearts club ads. Lonely Hearts is a 2006 American film directed and written by Todd Robinson.  It is based on the true story of the notorious "Lonely Hearts Killers" of the 1940s, Martha Beck and Raymond Fernandez.  The story of Beck and Fernandez was also the subject of the 1970 film "The Honeymoon Killers", directed by Leonard Kastle and the 1996 film "Deep Crimson", directed by Arturo Ripstein. Sgt. Pepper Knew My Father is a 1988 multi-artist compilation of 1980s artists recording new versions of the songs on The Beatles album "Sgt. Pepper's Lonely Hearts Club Band".  The album was produced by the "New Musical Express" to raise money for Childline, the charity founded by the now-defunct BBC1 consumer programme "That's Life! ".  It was also intended to celebrate the 21st anniversary of the original release of "Sgt. Pepper's Lonely Hearts Club Band" on 1 June 1967. Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple.  They are believed to have killed as many as 20 women during their murderous spree between 1947 and 1949.  After their arrest and trial for serial murder in 1949, they became known as "The Lonely Hearts Killers" for meeting their unsuspecting victims through lonely hearts ads.  A number of films and television shows are based on this case. Easy Star All-Stars is a reggae collective with a rotating roster of musicians and singers founded by the co-founders (Michael Goldwasser, Eric Smith, Lem Oppenheimer & Remy Gerstein) of New York City-based Easy Star Records in 1997.  The first original album by the band, released in 2003, was an interpretation of Pink Floyd's classic "The Dark Side of the Moon" entitled "Dub Side of the Moon"; the second was 2006's "Radiodread", a song-by-song cover of Radiohead's "OK Computer".  In April 2009, they released a cover of The Beatles' "Sgt. Pepper's Lonely Hearts Club Band" entitled "Easy Star's Lonely Hearts Dub Band".  In 2012, "Easy Star's Thrillah" was released, a cover of Michael Jackson's classic album. "Sgt. Pepper's Lonely Hearts Club Band" is a song written by Paul McCartney (credited to Lennon–McCartney), and first recorded and released in 1967, on the album of the same name by the Beatles.  The song appears twice on the album: as the opening track (segueing into "With a Little Help from My Friends"), and as "Sgt. Pepper's Lonely Hearts Club Band (Reprise)", the penultimate track (segueing into "A Day in the Life").  As the title song, the lyrics introduce the fictional band that performs on the album. The Honeymoon Killers is a 1970 American crime film written and directed by Leonard Kastle, and starring Shirley Stoler and Tony Lo Bianco.  It is inspired by the true story of Raymond Fernandez and Martha Beck, the notorious "lonely hearts killers" of the 1940s.  The soundtrack is from the first movement of the 6th Symphony and a section of the 5th Symphony of Gustav Mahler.  "The Honeymoon Killers" went on to achieve cult status as well as critical recognition.  It was released on DVD for the first time by The Criterion Collection in 2003.  François Truffaut called it his "favorite American film."

Supporting sentences:
Lonely Hearts is a 2006 American film directed and written by Todd Robinson.  It is based on the true story of the notorious "Lonely Hearts Killers" of the 1940s, Martha Beck and Raymond Fernandez. Raymond Martinez Fernandez (December 17, 1914 – March 8, 1951) and Martha Jule Beck (May 6, 1920 – March 8, 1951) were an American serial killer couple.