Malcolm Frederick 'Mal' Evans (27 May 1935 – 5 January 1976) was best known as the road manager, assistant, and a friend of The Beatles.

In the early 1960s, Evans was employed as a telephone engineer, and also worked part-time as a bouncer at the Cavern Club, where The Beatles performed. Manager Brian Epstein later hired Evans as their assistant road manager, in tandem with Neil Aspinall. Evans was tall and heavily-built, and Peter Brown (one of Epstein's staff) later wrote of Evans as "a kindly, but menacing-looking young man". Evans contributed to many Beatle recordings, and appeared in some of the films they made. Although The Beatles stopped touring in 1966, Evans carried on assisting the band until their 1970 break-up. From 1969 forward, Evans had also found work as a record producer (most notably with Badfinger's top 10 hit "No Matter What"), and as an occasional songwriter.

Evans was killed by police on 5 January 1976 at his home in Los Angeles. Officers were called when his girlfriend phoned the police and told them that Evans was confused and had a gun. The police believed that the air rifle Evans was holding was a rifle and shot him dead.

John Winston Ono Lennon, MBE (9 October 1940 – 8 December 1980) was an English musician and singer-songwriter who rose to worldwide fame as one of the founder members of The Beatles, one of the most commercially successful and critically acclaimed acts in the history of popular music. Together with Paul McCartney, he formed one of the most celebrated songwriting partnerships of the 20th century.

Born and raised in Liverpool, Lennon became involved as a teenager in the skiffle craze; his first band, The Quarrymen, evolved into The Beatles in 1960. As the group disintegrated towards the end of the decade, Lennon embarked on a solo career that produced the critically acclaimed albums John Lennon/Plastic Ono Band and Imagine, and iconic songs such as "Give Peace a Chance" and "Imagine". After his marriage to Yoko Ono in 1969, he changed his name to John Ono Lennon. Lennon disengaged himself from the music business in 1975 to devote time to raising his infant son Sean, but re-emerged with Ono in 1980 with the new album Double Fantasy. He was murdered three weeks after its release.

George Harrison,MBE (25 February 1943 – 29 November 2001) was an English musician and singer-songwriter who achieved international fame as lead guitarist of The Beatles. Often referred to as "the quiet Beatle", Harrison became over time an admirer of Indian culture and mysticism, and introduced it to the other Beatles, as well as their Western audience. Following the band's break-up he was a successful solo artist, and later a founding member of the Traveling Wilburys. Harrison was also a session musician and a film and record producer. He is listed at number 11 in Rolling Stone magazine's list of "100 Greatest Guitarists of All Time".

Although most of The Beatles' songs were written by Lennon and McCartney, Beatle albums generally included one or two of Harrison's own songs, from With The Beatles onwards. His later compositions with The Beatles include "Here Comes the Sun", "Something" and "While My Guitar Gently Weeps". By the time of the band's break-up, Harrison had accumulated a backlog of material, which he then released as the triple album All Things Must Pass in 1970, from which two hit singles originated: a double A-side single, "My Sweet Lord" backed with "Isn't It a Pity", and "What Is Life". In addition to his solo work, Harrison co-wrote two hits for former Beatle Ringo Starr, as well as songs for the Traveling Wilburys—the supergroup he formed in 1988 with Jeff Lynne, Bob Dylan, Tom Petty, and Roy Orbison.

Sir James Paul McCartney, MBE, Hon RAM, FRCM (born 18 June 1942) is an English musician, singer-songwriter and composer. Formerly of the Beatles (1960–1970) and Wings (1971–1981), he has been described by Guinness World Records as "The Most Successful Composer and Recording Artist of All Time", with 60 gold discs and sales of over 100 million albums and 100 million singles. With John Lennon, George Harrison, and Ringo Starr, he gained worldwide fame as a member of the Beatles, and with Lennon formed one of the most celebrated songwriting partnerships of the 20th century. After leaving the Beatles, he began a solo career and later formed the band Wings with his first wife, Linda Eastman, and singer-songwriter Denny Laine.

According to the BBC, his Beatles song "Yesterday" has been covered by over 2,200 artists—more than any other song. Wings' 1977 release, "Mull of Kintyre", became one of the best-selling singles ever in the UK, and he is "the most successful songwriter" in UK chart history, according to Guinness. As a songwriter or co-writer, he is included on thirty-one number one titles on the Billboard Hot 100, and as of 2012 he has sold over 15.5 million RIAA certified units in the United States.

Stephen Robert "Steve" Irwin (22 February 1962 – 4 September 2006), nicknamed "The Crocodile Hunter", was an Australian wildlife expert, television personality, and conservationist. Irwin achieved worldwide fame from the television series The Crocodile Hunter, an internationally broadcast wildlife documentary series which he co-hosted with his wife Terri. Together, the couple also owned and operated Australia Zoo, founded by Irwin's parents in Beerwah, about 80 kilometres (50 mi) north of the Queensland state capital city of Brisbane. Irwin died on 4 September 2006 after being pierced in the chest by a stingray barb while filming an underwater documentary film titled Ocean's Deadliest. The Sea Shepherd Conservation Society ship MY Steve Irwin was named in his honour.

Irwin was born on his mother's birthday to Lyn and Bob Irwin in Essendon, a suburb of Melbourne, Victoria. He moved with his parents as a child to Queensland in 1970, where he attended Landsborough State School and Caloundra State High School. Irwin described his father as a wildlife expert interested in herpetology, while his mother Lyn was a wildlife rehabilitator. After moving to Queensland, Bob and Lyn Irwin started the small Queensland Reptile and Fauna Park, where Steve grew up around crocodiles and other reptiles.