Sheila Deadbones is a pre-made Sim that is deceased at the start of The Sims 2 for consoles, and resides at Sunset Canyon. She shares the normal +20 relationship with all her roommates, though, Billy's relationship list states they have a neutral 0 relationship. According to her, and Helga's bio, she could have had a part in Helga's death.
She was an actress who died in an unfortunate accident. Since her youth, she has been a pirate.