Bobby Beale killed his older sister Lucy Beale accidentally when he was a child. The incident occurred after a confrontation at home where Bobby, frustrated with Lucy's behavior and shouting, lashed out by hitting her on the head with a jewellery box. Lucy then hit her head on a table and died from the injury. Bobby did not realize he had killed her at the time. His adoptive mother, Jane Beale, covered up the incident by moving Lucy's body and convincing Bobby that he was not responsible for her death. The family kept the secret from Bobby, the police, and the residents of Walford for some time
. Later, Bobby's guilt and the secret caused significant turmoil within the family. Eventually, Bobby confessed to killing Lucy, leading to his arrest and sentencing to three years in a young offenders institution for her murder
