Cassie Laundrie is the sister to Brian Laundrie and spoke with ABC News' Good Morning America. Good Morning America
Brian Laundrie's sister sent postcards to Gabby Petito, who was on the road trip with her.
After Petito's body was discovered, Cassie Laundrie sent condolences.
On Tuesday, the full autopsy results will be available.
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Gabby Petito's sister shared Monday texts and postcards she sent to her from their road trip.
Cassie, Laundrie's sister, also condoled with Petito's family Monday in a statement that stated that "Gabby was fun and loving influence to the boys' as they always referred to her," ABC News reported.
After a huge missing-person hunt, a body that matched Petito's description, was discovered on Sunday, near Grand Teton National Park in Wyoming. On Tuesday, the results of an autopsy will be available.
Brian Laundrie, who refused to help authorities during the search, went missing last week.
"The boys" are Cassie Laundrie’s children. Petito seems to have sent them cheerful postcards during her road trip.
Petito signed the cards "Aunt Gabby" and wrote about what she saw on her "van-life", trip.
"Oh my goodness! "Oh my gosh! Uncle Brian and I were sitting on a rock, eating a snack after a long hike. And then came the fattest squirrel that I've ever seen!" "She landed right on my lap!" She wrote one card.
"The sky is so wide, there are more stars than I have ever seen!" She wrote another note, possibly from Utah's Bryce Canyon National Park.
ABC4 also shared cards that featured colorful drawings of rock formations seen by the couple on their trip. "The rocks are amazing!" Petito wrote.
"Uncle Brian, and I have seen many different types of rock, I knew there was a variety of rocks, but I didn’t know that some formations are different, did you?" She continued.
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Gabby Petito captured her travels via Instagram. Instagram/@gabspetito
Petito, who was also upbeat in the text message dated August 10, mentioned the children's return at school and asked for photos.
She wrote that she was in Arches at the moment so they don't have the best WiFi. However, she did send her some mail and added a hugging emoticon. Arches could refer to Utah's Arches National Park which the couple suggested they visited on social media.
Cassie Laundrie, the only member of Petito's family that has spoken with media since Petito disappeared, is Cassie Laundrie. On September 17, she gave an interview to ABC News in which Petito was described as "like a sibling."
Fox 13 News reported that two people believed to be law enforcement visited Cassie Laundrie’s Lakewood Ranch residence on Monday.
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