Due to the amount of Sims he knows, he does not have Helga in his relationships list, even though she shares the highest +20 relationship with him. In Sheila and Red S.'s relationship list, they have a +20 relationship with Billy, though in his list, he shares a +0 relationship with both, like everybody else.
Billy was a bitter actor who once shot an intern. He died in an accident, and has enjoyed his life as a ghost (though that hasn't changed his mean spirit). He starts out in Sunset Canyon as a ghost. By fulfilling his Gold and Platinum Wants, The Orbit Room, a bonus location, is unlocked.
Despite his surname being Specter, it's unlikely that he's related to the Specter family.