Brian Laundrie returned home alone in the middle of his trip with Gabby Petito, his sister said.
In a video shared with NewsNation, Cassie Laundrie answered questions outside her home.
She said Laundrie didn't mention getting into a fight with Petito.
Brian Laundrie's sister said he returned home to Florida alone five days after the police in Utah stopped him and his fiancée, Gabby Petito, in Utah.
Petito's disappearance and death during a road trip with Laundrie have drawn widespread attention. In an interview with a man who claimed to know the Petito family that was shared with NewsNation, Laundrie's sister, Cassie, said her brother returned home alone on August 17.
He rejoined Petito before returning alone to his family home with her truck on September 1. Petito's family reported her missing on September 11.
The police had pulled over Laundrie and Petito in Moab, Utah, on August 12. Body-camera footage from the stop showed Petito crying and telling officers she and Laundrie were having some personal issues.
"Some days I have really bad OCD and I was just cleaning the back of the van before, and I was apologizing to him, saying, 'I'm sorry I'm so mean,' because sometimes I have OCD and sometimes I get really frustrated," she told a police officer. "Not like mean towards him, I guess my vibe. I'm just in a bad mood."
Petito said she hit Laundrie but didn't intend to harm him. The police initially wanted to charge Petito with domestic violence but ruled it a mental-health incident rather than a domestic-violence case and had the couple separate for the night.
Fox News later obtained audio of a 911 call in which a bystander said he saw Laundrie "slapping" Petito during the same incident before the police pulled them over.
Cassie Laundrie said she saw her brother during his August 17 visit home and everything seemed normal. She said she didn't know when he returned to his trip with Petito.
"He was telling me where they were going next. I FaceTimed with Gabby and the kids on that trip," she said, referring to her own children.
She added that Laundrie did not say he got in a fight with Petito.
Laundrie was reported missing from his family home on September 17 and is the subject of an FBI-led search. He was named a person of interest in Petito's disappearance.
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