European Parliament President David Sassoli has died at a hospital in Italy, his spokesman said in a tweet Tuesday.

No details were offered in the tweet by spokesman Roberto Cuillo beyond Sassoli’s death at 1:15 a.m. Tuesday in Aviano, a city in northeastern Italy.

Sassoli had been hospitalized since Dec. 26 due to abnormal functioning of his immune system, Cuillo said in a statement Monday.

Sassoli, 65, was first elected at the European Parliament in 2009. He won another term in 2014 and served as the Parliament’s vice president. He had decided not to run for reelection when lawmakers vote to appoint their new president later this month.