Brian Laundrie's sister said she hasn't heard from her brother or parents since Gabby Petito went missing last month.
Cassie Laundrie also described the last time she saw and spoke to Brian, 23, who cops want to speak to in relation to Gabby's murder – and has become one of America's most wanted.
That fateful conversation took place at Florida's Fort De Soto Park on September 6, the day Brian returned from his cross-country road trip without girlfriend Gabby.
Shortly after Petito was declared missing on September 11, Brian fled from the home.
Cassie told Good Morning America she wished she noticed something off about her brother's behaviour – and reported the meeting to police as soon as Petito was declared missing.
She said: "I’m frustrated that in hindsight I didn’t pick up on anything. It was just the regular visit.
“We just went for a couple of hours and we ate dinner and had S’mores around the campfire and left.
“There was nothing peculiar about it.
"There was no feeling of grand goodbye — there was no nothing."
Cassie also urged Brian and parents Christopher and Roberta to come forward immediately.
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She also admitted she doesn't know whether her parents are involved in Brian's apparent escape from the authorities.
Asked whether she knew where Brian was, Cassie said: “No, I do not know where Brian is — I’d turn him in.
“I would tell my brother to just come forward and get us out of this horrible mess.
“I worry about him. I hope he’s okay — and then I’m angry and don’t know what to think.
“I’ve tried to get in touch with him — phone went to voicemail.
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"I hope my brother’s alive, because I want answers just as much as everybody else.”
Brian's big sister, who is in her mid-30s, said her kids referred to Petito as "auntie Gabby".
The popular vlogger, 22, was found dead on September 21, with cops ruling her death a homicide.
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