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(NewsNation Now) — Gabby Petito died by strangulation three-to-four weeks before her body was found, Teton County Coroner Dr. Brent Blue said at a Tuesday news conference.

Blue declined to speculate whether he believed her boyfriend at the time, Brian Laundrie, was involved. “We are only tasked with cause and manner of death,” he said. “Who committed the homicide is up to law enforcement.”

He said only the cause of death, strangulation, and manner of death, homicide, would be released. Blue first ruled the death a homicide on Sept. 21.

Petito vanished while on a cross-country road trip with her boyfriend Brian Laundrie in a converted camper van. The trip was well-documented on social media until it abruptly ceased, allegedly somewhere in Wyoming. The couple documented most of their trip, which started in July, on a YouTube Vlog called “VAN LIFE”.

Petito, 22, was reported missing Sept. 11 by her parents after she did not respond to calls and texts for several days. Petito’s body was found Sept. 19 just outside Grand Teton National Park in Wyoming.

The FBI has issued an arrest warrant for Laundrie. He is wanted for “use of unauthorized access device” related to his activities following Petito’s death. The FBI says he used a debit card and a PIN to access two bank accounts Aug. 30 and Sept. 1.