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"My oldest brother, Don Reed, died from coronavirus on Tuesday evening," Warren, 70, wrote on Twitter. "He joined the Air Force at 19 and spent his career in the military, including five and a half years off and on in combat in Vietnam. He was charming and funny, a natural leader."
The coronavirus has proven especially deadly for seniors.
Warren gained a national spotlight in 2019 after announcing her presidential campaign. Never able to cement frontrunner status, she dropped out in March.