Joseph Young was sentenced Friday in the grisly mafia slaying at the Kreischer Mansion

Former caretaker of a historic Staten Island mansion has been sentenced to life in prison for killing a man before dismembering his body and burning the pieces in a furnace.Thirty-year-old Joseph Young was sentenced Friday in the grisly mafia slaying at the Kreischer Mansion. He was convicted of murder in aid of racketeering following a trial in October in Brooklyn federal court.Prosecutors say a reputed member of the Bonanno crime family paid Young $8,000 to kill Robert McKelvey in 2005. The mobster has already pleaded guilty to ordering McKelvey's death, allegedly over a debt.Young has also been convicted of setting a home on fire and robbing an illegal massage parlor at gunpoint in New Jersey.