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Dr. Brent Blue said the cause of death was strangulation and the manner was homicide.
The 22-year-old Long Island native was killed three or four weeks before her body was found on Sept. 19.
Petito was last seen with boyfriend Brian Laundrie, 23.
Authorities issued a warrant for Landrie's arrest after he apparently used Petito's debit card after her death.
This is a developing story. Check back for more.
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