|Portrayed by||Paul Nicholas|
|Introduced by||Dominic Treadwell-Collins (2015)|
|First Appearance||21st August 2015|
|Last Appearance||8 July 2016|
|Other names|| Gavin Richards |
In August 2015, after Kathy arranged to meet Phil to begin planning her return to Walford, however the meeting was cancelled after Ian and Sharon followed Phil to St Pancras train station. Just as Kathy is leaving the station, Gavin stops her and tells her that he knows exactly what she's planning.
In July 2016, Gavin makes a last-ditch attempt to salvage a relationship with his family by giving his grandson Dennis large amounts of money and also luring Kathy to his secluded countryside mansion. His plan is foiled by his sister Margaret and during an altercation between the two, Gavin accidentally kills Margaret by pushing her off an exterior balcony. Having witnessed the accident, Sharon tracks Gavin down and tries to convince him not to run and own up to his crimes on the promise that Sharon and Dennis will remain in his life. He ultimately decides to run but he is quickly arrested by the police for Margaret's death.
Gavin Bennett is the birth father of Sharon he was 16 years old when he meet Carol he was working in a shoe shop and he was 16 years old when Sharon was born. in 2015 Sharon is looking for him he lived in Walford and was friends with his daughter adoptive father Den and Arthur.
Gavin Sullivan was born in about 1950 in Walford, London, E20. He was one of 3 children, he has 2 sisters, Sally and Margaret Midhurst. He and his siblings lived above doctor Harold Legg's surgery with their mother Ivy Sullivan after their father left their mother. According to Dot Ethel Skinner use to feed the children but Gavin would steal out of Ethel's purse. Ivy used to bring lots of men home as Gavin and his sisters were growing up.
He was friends with Ted Hills, Den Watts, Eric Mitchell and Vincent Hubbard's father Henry Hubbard Gavin had a photo taken with those friends in about 1965 which he kept on him. In 1969, Gavin had a brief affair with Carol Stretton and she gave birth to a daughter Sharon who was later adopted by Gavin's friend Den Watts and his wife Angie. Gavin emigrated to South Africa.
Ted Hills, Gavin's friend moved to South Africa and him and Gavin remained friends. Gavin romanced Kathy Mitchell, Ted's younger sister, who had left her thuggish husband Phil Mitchell to join her brother in South Africa. Gavin and Kathy married in 2001 and Gavin was Ben's stepfather.
In June 2015, Paul Nicholas was cast to play Gavin, Kathy's estranged husband.
Speaking about Kathy's third husband Gavin, played by Paul Nicholas, Treadwell-Collins said: "If everything works out, and I hope it will, Gavin is going to be an EastEnders villain like no other.
"He's going to be modern, complex, and have a little a foot in the past and a foot in the present."