Brian Laundrie’s sister said Brian returned home to North Port, Florida, for five days after an incident between he and Gabby Petito in Moab, Utah, per Insider.

Cassie Laundrie said in an interview shared with NewsNation that her brother returned home from a road trip with Petito on Aug. 17.

He later returned to Moab to join Petito. Laundrie returned home on Sept. 1, driving Petito’s white van. Petito did not return with Laundrie. She was reported missing on Sept. 11.

Laundrie’s initial return home would have happened five days after the Aug. 12 incident in Moab, Utah, according to Insider.

Moab police responded to the incident after an eyewitness called 911, saying that Laundrie was “slapping the girl ... they ran up and down the sidewalk. He proceeded to hit her, hopped in the car, and they drove off.”

Brian Laundrie’s sister reveals what she knows about her brother’s whereabouts
Cassie Laundrie has a message for her brother, Brian Laundrie

Moab police stopped Gabby Petito and Brian Laundrie outside of Arches National Park. Police spoke with Petito and Laundrie about what happened. Per the Deseret News, the police said Petito had slapped Laundrie but no charges were pursued. Laundrie was taken to a nearby hotel, and Petito drove off with the van.

According to the Deseret News, the couple reunited and left Moab together. They drove through Salt Lake City on the way to Wyoming.

Cassie Laundrie said in an interview shared with NewsNation that she saw her brother on Aug. 17 when he visited his home. Everything seemed normal, she said. But, she said, it wasn’t clear why Petito wasn’t with him.

“He was telling me where they were going next. I FaceTimed with Gabby and the kids on that trip,” she said, meaning she and her kids FaceTimed with Gabby.

These high school yearbook photos show Brian Laundrie, Gabby Petito years before recent incident

Laundrie did not tell his sister about the argument, she said in the interview.

It was about one month later, on Sept. 19, that Petito’s body was found outside of Grand Teton National Park.

Brian Laundrie, who was reported missing on Sept. 17, has not been found. Police are still on the lookout for him, as he is a person of interest in the Petito case and he’s wanted on an arrest warrant.