Peter Berry, 60, collapsed and died of a heart attack while running in Central Park on Sunday, according to the Daily News. His half brother Rynn Berry, 68, went into cardiac arrest during a New Year's Eve run in Brooklyn's Prospect Park and died on Jan. 9.
"It's been a shock for the family," said Charles Berry, the men's last surviving sibling. "It's still hard to believe. We're just grateful for all the kind support."
A memorial service was set for Monday at St. James Church in Upper Manhattan.
Rynn Berry, who had no identification on him, lay comatose and unidentified in a Brooklyn hospital for several days until his half sibling identified him after seeing a photograph on social media of a man in a hospital bed with tubes attached to him.
Rynn Berry was a respected figure in the vegetarian and vegan movements. He self-published a book titled "Vegan Guide to New York City" and wrote several other books on the history of vegans and vegetarians.
Peter Berry was a graduate of Yale and Boston University Law School and worked in tax and corporate trust law.
"Peter was in very good shape," Charles Berry said. "He was incredible with yoga - very limber."
Both men had competed in the New York Marathon.
The Daily News said that an older brother, Eliot, died of heart failure in 2008 at age 59. He was a world-class squash player, an all-Ivy League football kicker and an accomplished tennis player.