Gabby Petito case: Cassie Laundrie speaks to protesters outside Lakewood Ranch home

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Brian Laundrie's sister says she hasn't spoken to parents since Fort De Soto camping trip

Kimberly Kuizon reports

Speaking candidly about the case, Brian Laundrie's sister is giving new insight into the timeline ahead of his disappearance. Cassie Laundrie says she is just as frustrated and heartbroken as everyone else about Gabby Petito’s death and her brother’s disappearance.

NEW TIMELINE: Laundrie attorney confirms Brian left to hike preserve day earlier than parents previously claimed

"We don’t have a lawyer, we have nothing to hide," Cassie Laundrie told demonstrators outside of her Lakewood Ranch home. It’s the first time she’s spoken publicly since her brother’s fiancée’s remains were discovered in Grand Teton National Park.

"We were told not to talk to anybody and I’m upset we have to come out and do this and explain myself to the FBI," she said. 

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Possible Laundrie sighting in North Carolina

The search for Brian Laundrie is expanding as the FBI investigates new tips coming in of possible sightings. The latest comes from a hiker on the Appalachian Trail who tells Fox News he spoke with a man he's convinced is Laundrie. FOX 13's Jordan Bowen has the story.

RELATED: Where is Brian Laundrie? Report of possible sighting on the Appalachian Trail

Cassie told the group outside her home that their loud chants were upsetting her children but she also answered questions and spoke candidly about the case.

"We are just as upset, frustrated and heartbroken as everyone else. And I am losing my parents, my brother and my children’s aunt and sister-in-law on top of this," she said.

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Utah police release second bodycam video in Gabby Petito incident

New video was released in the Utah incident involving Gabby Petito and Brian Laundrie, which adds more context to an investigation into Petito's death.

Cassie provided insight into a timeline that continues to develop. She says on August 17, five days after Brian and Gabby were captured on Moab police bodycam footage following an argument, her brother flew home and emptied out a storage unit. 

"He was telling me where they were going next. I Facetimed with Gabby and the kids on that trip," Cassie recalled. 

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Cassie Laundrie speaks out with brother on the run after Gabby Petito's homicide

Brian Laundrie's sister, Cassie, told protesters outside her home that her family has been ignoring her following the disappearance of her brother and the death of Gabby Petito.

The attorney for Brian's parents said in a statement that he cleaned out the storage unit so the couple could save money as they looked toward extending their road trip. 

RELATED: Brian Laundrie search: Could parents face obstruction, accessory charges?

Cassie says the last time she saw and spoke to both Brian and her parents was on September 6 during a camping trip at Fort De Soto. She says she did not know Gabby was missing until a detective called her on September 11.

"Did he say he got into a fight with Gabby? No, nothing. That was just about as a surprise to us, too. We are unfortunately in the dark, too, just as much as everybody else. More so," Cassie said. 

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Raw video: FBI agents look over Laundrie family camper

Two agents pulled up to the North Port home where Brian Laundrie’s parents live. They went inside with a large paper bag and took a closer look inside the family’s parked camper amid the search for the missing suspect.

MORE: Brian Laundrie's family says this is why he went to Florida without Gabby Petito

Former FBI agent and current lawyer Stuart Kaplan says Cassie seems sincere.

"To be quite frank, I found Brian Launrie’s sister seemingly was very credible and very believable," Kaplan said. 

He says the FBI will be looking into the recording to see if her statements match up. 

"This is a very very serious case. There’s a lot of twists and turns, and the reality is the only one who knows what happened is Brian Laundrie and, unfortunately, Gabby Petito who is dead," Kaplan said. 

Brian Laundrie's parents leaving their North Port home

As investigators work to find Brian, Cassie appeared on ABC News, asking her brother to do the right thing. 

"I would tell my brother to come forward and just get us out of this horrible mess." 

Cassie says she hopes her brother is alive. She and her husband said they would like to give their sons some answers so they can see their grandparents again.

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Attorney questions sister's timeline in Brian Laundrie search

It's now been one month since Brian Laundrie returned home to North Port without Gabby Petito. Questions are being raised about his sister and they last time she saw him.

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