Petrillo was the daughter of slain newspaper heiress Anne Scripps Douglas. Stepfather Scott Douglas leaped to his death from the bridge in 1994 after killing her mother. The family founded The Detroit News.
Witnesses saw Petrillo stop her car on the bridge and jump Thursday.
She left a note, but police have refused to describe it.
Police say the Rockland County medical examiner's office will make the official identification.
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