European Parliament President David Sassoli has died in a hospital in Italy, according to his spokesperson in the early hours of Tuesday.

The 65-year-old had been hospitalized since Dec. 26 because of "a serious complication due to a dysfunction of the immune system," his spokesperson Roberto Cuillo revealed Monday when announcing the cancellation of Sassoli's official activities.

Hours later, Cuillo announced Sassoli's death.

"The @EP_President David Sassoli passed away at 1.15 am on 11 January at the CRO in Aviano (PN), Italy, where he was hospitalized," Cuillo announced on Twitter.

"The date and place of the funeral will be communicated in the next few hours."