As Naomi on Lost, Marsha Thomason got literally stabbed in the back by John Locke and killed off that TV show.
But the actress has a much brighter future ahead of her on White Collar: she's been promoted to a series regular on the USA hit.
As first reported by Entertainment Weekly, Thomason's character (junior FBI agent Diana Lancing) appeared in the White Collar series premiere, but hasn't been seen or heard from since. Look for her to reappear in the March 9 finale and then be featured heavily on season two.
The actress recently completed an arc on General Hospital, portraying the girlfriend of James Franco's psychotic killer.