Brian Laundrie's sister says she does not know where he is, and 'I'd turn him in'

'No, I do not know where Brian is. ... I'd turn him in,' Cassie Laundrie said. Authorities are searching for her brother, Brian Laundrie, after the death of his fiancée, Gabby Petito.

"No, I do not know where Brian is. ... I'd turn him in," Cassie Laundrie said in an exclusive interview with ABC's"Good Morning America" that aired Tuesday. Cassie Laundrie said if she could talk to her brother, she would tell him to come forward. "I worry about him. I hope he's OK, and then I am angry and don't know what to think. ... I would tell my brother to just come forward and get us out of this horrible mess," she said.

Investigators have since spent days searching for Laundrie at the Carlton Reserve outside Venice, Florida.The day Cassie Laundrie learned of her brother's disappearance, she informed authorities of the September 6 camping trip, she told ABC."It was not hidden from law enforcement. ... I've been cooperating with the police since day one. I have been in touch with law enforcement," she said.

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