Billie's mum is Carol Jackson and his dad is Alan Jackson. He grew up in Walford from a young age and has always been the apple of his mother's eye. He has been portrayed by Devon Anderson between 1993-1997, Bluey Robinson in 2004 then Devon returns for 2010. He is one of four children. He first appeared when he was five years old he is the youngest out of four children.
Billie is the only son of Carol and Alan Jackson and he arrives in Walford in 1993 along with his half brother Robbie and his half sisters Bianca and Sonia. He is very close to his father and when Alan has an affair with the malicious Frankie Pierre and moves out of the family home, Billie takes the separation badly. On Christmas Day 1996, he becomes so upset that Alan is not there for the festivities that he runs away from home, prompting most of the Square's residents to abandon their Christmas dinners to search for him. He is found by Nigel Bates and Clare Bates, hiding in a derelict building. They return him to his worried parents and the Jacksons eventually have a happy Christmas together, including Alan.
In February 1997, Billie accompanies his great grandmother Blossom Jackson on a trip to a local building society. Whilst there, the building society is held up at gunpoint and robbed by a gang of masked thieves. Billie and Blossom are unharmed, but another man is shot and killed and Billie, the only witness, gets a glimpse of the thieves without their masks on. Billie is asked to provide testimony and help identify the thieves in a police line-up, which leads to several arrests. Carol remains apprehensive about Billie's involvement throughout the ordeal. In September 1997, the Jacksons hear news that the court case to try the suspected robbers is soon to take place. The family then suffer intimidation from the gang, in order to stop Billie from testifying against them. After picking Billie up from school one day, a woman claiming to be a supply teacher approaches Carol and asks if she can talk about Billie's behaviour. Whilst she is distracted, some men jump out of a van, bundle Billie inside, and drive off. After several days of investigation, the police trace Billie and he is reunited with his family. After this, the Jackson family, apart from Bianca, are placed in a witness protection program and rehoused away from the Square for their own safety. They depart on 16 October 1997.
Following the trial, Robbie and, later, Sonia return to Walford and Carol also returns in 1999 when she splits up with Alan for a second time. Billie remains living with his father and grandmother in Balham and Carol later returns to live with them. Billie returns to the Square briefly in June 2004 to attend Sonia's wedding to Martin Fowler, and flirts with Martin's niece, Vicki Fowler, at the reception and gets drunk.
Billie returns to Walford in 2010, calling at Bianca's home, and later attends her wedding. After his cousin Bradley Branning dies, Carol and Billie move back to Albert Square and Billie starts seeing Bianca's adopted daughter Whitney Dean. It is revealed that Billie is hiding a handgun in Bianca's home. He tells his former gang mates, Kylie, Connor Stanley and Mitch Gannon, that he has disposed of it, but after they arrive in Walford and find the gun, and plan to hold up The Queen Victoria public house. However, Billie is unmasked during the raid and it is revealed he used a water pistol. He then chooses Whitney over his former gang members, so Kylie takes revenge by attempting to shoot Billie with his gun, but accidentally shoots his uncle Jack Branning instead, who is left critically ill in hospital. Blaming himself, Billie announces his plan to join the army, but Carol is opposed to the idea until she discovers the gun came from Billie and tells him the army is the best place for him. When he is accepted into the army, Whitney promises to make the most of their remaining two weeks together. However, he discovers that Leon Small kissed Whitney and is angry when she does not mention it, but she insists she has not cheated on him. Billie apologises, and they reunite before Billie goes away for army training. When Billie is due to return on leave, he tells Carol that the army have denied it. However, Carol, Whitney and Bianca discover that he is taking his leave with friends instead of returning to Walford.
When Billie finally does return to see Whitney, he upsets her by ending their relationship, saying he has changed. He reveals he has started a relationship with a female recruit named Siobhan, and decides he should leave. Whitney's brother Ryan Malloy punches him in the face. Carol overreacts as she wipes the blood off him so Billie snaps at her, saying she causes carnage wherever she goes. He then says she does not have to worry about him as he has a new life now. For Billie's birthday, Carol arranges a birthday party, but discovers from Whitney that he is having a party in Southend-on-Sea. Bianca brings him back to Walford on his birthday, and he makes amends with Jack. At the party, Billie's friends bring lots of alcohol and his cousin, Lauren Branning brings a bottle of vodka, which Billie drinks in one go. Carol decides to let him keep on drinking as he is an adult and makes his own choices. The next morning, the family think Billie is sleeping on the settee, but Bianca finds him dead when she tries to wake him, having died from choking on his own vomit from alcohol poisoning. His body is later taken away by undertakers. Whitney later discovers a text message on her phone from Billie, saying he still loves her and wants to make a go of things again. Billie's personal possessions are brought home to Carol, one of which is his laptop, on which Carol discovers a video of Billie saying he wishes she would drop dead. Billie's funeral takes place on 29 October 2010.