is the daughter of a psychic hunter named Celeste LeBeau and a hunter named John Winchester. Many years after Mary died and John fathered Adam Milligan, John met Celeste when he needed help in NOLA regarding a supernatural threat. One thing led to another and they conceived Lucy. John left the night Lucy was conceived and never returned. Celeste, being a psychic, saw her own death and when the time came she died giving birth to Lucy. Lucy grew up in the foster care system, never finding a true home due to her psychic abilities scaring off all potential adopters and foster parents. Eventually Lucy aged out of the foster care system and managed to get a full ride scholarship to Juilliard due to her amazing musical skills.
When Lucy graduated she found herself busking just to make ends meet, but soon she grew quite popular. She knew nothing about her parents and was all alone for years until she met a hunter named Bobby Singer, who was told to check in on the young woman by John who couldn't bring himself to even visit her. Bobby trained her to be a hunter and gave her one name that could lead her to the answers she had been seeking all of her life. Winchester. Lucy took this as her surname, knowing that the name meant something to her.
During a hunt she received a near fatal stab wound from an urban legend Lucy accidentally warped into reality while researching a case. She was stabbed in the chest and crashed her car requiring emergency surgery. While in the hospital Lucy met a woman by the name of Charlotte Kingsley, her doctor who happened to nurse her back to health. Once released from the hospital Lucy asked her out. They soon started dating and Lucy asked Charlotte to be her girlfriend. However, Lucy refused to ever tell Charlotte about the supernatural world for fear of endangering her.
During a hunt she received a near fatal stab wound from an urban legend Lucy accidentally warped into reality while researching a case. She was stabbed in the chest and crashed her car requiring emergency surgery. While in the hospital Lucy met a woman by the name of Charlotte Kingsley, her doctor who happened to nurse her back to health.
As a surprise to Lucy, who had been desperately researching her parents to find out who they were, Charlotte managed to get her birth certificate which had the names of her parents, Celeste LeBeau and John Winchester. She soon met Sam and Dean on a hunt, and upon hearing their last names she revealed what she had learned. At first they didn't believe her until she showed them her birth certificate. Eventually they grew close, but Lucy grew the closest to Dean, though she eventually met Castiel and Jack Kline.
Many years later Lucy managed to meet a woman named Celeste LeBeau who had supposedly died during childbirth, however the truth was that Celeste managed to avoid her death and had been looking for Lucy for years, but to no avail due to a mix up at the hospital that said Lucy had died during childbirth when in fact it was another child and another mother who had died with similar names. Lucy then met with her mother and managed to form a relationship with her, no longer feeling quite as lonely now that she had her brothers, her girlfriend, and her mother.