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Dick Eastland, the director of Camp Mystic, was among the dead from Friday's historic Guadalupe River flood.
Eastland's nephew, Gardner Eastland, confirmed the death in a Facebook post on Saturday.
His wife, Tweety, was found safe at their home.
City officials said Saturday that 27 girls from Camp Mystic, a private Christian summer camp, are still missing.
At least 27 people have died, including 18 adults and nine children, and an untold number more are missing after flooding ravaged the Hill Country on Friday.
The 99-year-old Camp Mystic, a riverside retreat that was hosting some 750 campers, was among several campsites struck by the catastrophic floodwaters.
Officials said on Friday that some of those campers listed as missing may be stranded and unable to call for help.
The camp was built in 1926. The Eastlands have owned it since 1974.