The man suspected of drunken driving and killing a Catholic nun in Prince William County this weekend is an illegal immigrant who was awaiting deportation and who federal immigration authorities had released pending further proceedings, police said Monday. The man, Carlos Montano, a county resident, had been arrested by police twice before on drunk-driving charges, and on at least one of those occasions county police reported him to federal authorities. "We have determined that he is in the country illegally. He has been arrested by Prince William County Police in the past," said Officer Jonathan Perok, a police spokesman, who...