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Cassie Laundrie is ready for her brother Brian to come forward.

Laundrie, whose brother is at the center of a manhunt after the death of his fiancée Gabby Petito last month, spoke with ABC News on Tuesday about her missing brother, sharing that she does not know his whereabouts. 

“I would tell my brother to just come forward and get us out of this horrible mess,” Cassie said in an interview on Good Morning America.

Cassie remembers her brother stopping by her home in Florida in September for an “ordinary” visit the day he returned from his reported road trip with Petito in her 2012 Ford Transit. Cassie said she doesn’t “think we’d be here” if he visited her first with the van.

Cassie said she never saw any signs of domestic violence although it was “pretty typical of [Brian and Gabby] to argue and try and take space from each other.” The Moab City Police Department in Utah previously pulled over Laundrie for reports of him slapping Petito.

Gabby Petito’s body was found in Wyoming’s Bridger-Teton National Forest on Sept. 19 after being at the center of a search since her family reported her missing on Sept. 11.

“We just went for a couple of hours and we ate dinner and had s’mores around the campfire and left, and there was nothing peculiar about it,” Cassie remembered of Brian’s visit to Florida. “There was no feeling of grand goodbye. There was no nothing.”

A North Carolina hiker said he spotted Laundrie in an Appalachian Trail parking lot on Saturday, claiming that they had a conversation.

“I started talking to him and immediately I could tell that there was something wrong with the guy, I thought that maybe he was on drugs or something at first,” said Dennis Davis, who claimed Laundrie mentioned having a fight with his girlfriend. “What he said to me at the start was, ‘Hey, man, I’m lost.’”

Cassie added to GMA that she hopes her brother is alive, and said she’s been cooperating with authorities “since day one.”

“I don’t know if my parents are involved,” she said. “I think if they are, then they should come clean.”

Speaking with protesters at her home on Monday, Cassie reiterated many of the same points and said she’s cooperated with law enfoecement and is unaware of where her brother is. She also told the people filming that Brian did not visit her house in Gabby’s vehicle, but rather her parents’ Mustang. She added that her parents aren’t speaking with her.

“We are just as upset, frustrated and heartbroken as everybody else,” she said on her front lawn in the video shared by TMZ, above. “And I am losing my parents and my brother and my children’s aunt and my future sister-in-law on top of this, and you’re not helping.”