Frank Lautenberg — the 89-year-old Senator who said he wouldn't seek reelection in 2014 — has died.

Email from CNN says that the "New Jersey Democrat who had served five terms in the U.S. Senate since 1982 and was the chamber's last surviving World War II veteran, died Monday of viral pneumonia."

Another U.S. Senate seat that must be filled before next year's elections.

ADDED: "Gov. Chris Christie will appoint his temporary replacement and schedule a special election; Cory Booker has not been shy about his intention to run for the seat."