Tragedy struck President Barack Obama’s campaign on Friday as a young staffer, 29-year-old Alex Okrent, collapsed in the Chicago headquarters and died, according to campaign officials.

Obama, campaigning in Virginia, telephoned Okrent’s family to express his condolences and later spoke with other campaign aides by conference call. The aide had been with Obama since 2004 and was working in the “paid media” department of the reelection effort, which handles advertising, a campaign aide said.