Sullivan's three adopted grandson -- ages 10, 8 and 5 -- and their nanny, 43, were injured in the crash.
Sullivan rose to prominence working to preserve Papua New Guinea's tribal cultures and protect its environment from logging and mining operations, according to guardian.com.
As per her wishes, Nancy Sullivan's body will be cremated, with her ashes to be spread both at her family's summer cottage and in Papua New Guinea.
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