A Democratic aide confirmed the death of the New Jersey senator. The aide spoke on condition of anonymity because he was not authorized to publicly discuss the death before it was formally announced.
Lautenberg had health problems in recent years. A bout with the flu caused him to miss the Senate's Jan. 1, 2013 vote to avoid the fiscal cliff of rising taxes and falling government spending.
He had been diagnosed in February 2010 with lymphoma of the stomach and underwent chemotherapy for the next few months.
He was principal sponsor of a law banning smoking on domestic airline flights.