An ex-boyfriend of Anna Nicole Smith who is serving a six-year sentence for making criminal threats against her wants a piece of her inheritance, according to documents filed with Los Angeles Superior Court.

Mark Hatten, who lists his current address as the Pleasant Valley State Prison in Coalinga, dated Smith in 2000 but was later found guilty of threatening her with a knife and assaulting one of her neighbors. He was acquitted of stalking her.

He filed his claim Wednesday in Superior ...