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For a walk in the reserve. what are we supposed to do? go tree to tree, following him back to the woods? i mean, you know, it just wasn't there with the information we had. in this case. >> reporter: petito's remains were found in wyoming on september 19th. the coroner ruling it a homicide. police say they never spoke with laundrie before he left the home he and petito shared with his parents. they did not see or speak with him during the visit on september 11th, the day petito's parents reported her missing. authorities visited the home on september 17th when laundrie's parents reported him m...

Going to go find him back through the woods? i mean, um, you know, it just wasn't there with the information we had. in this case. >> reporter: petito's remains were found in wyoming on september 19th. the coroner ruling it a homicide. police say they never spoke with laundrie before he left the home he and petito shared with his parents. they did not see or speak with him during their visit on september 11th, the day petito's parents reported her missing. authorities visited the home, again, on september 17th when laundrie's parents reported him missing but refused to answer questions about p...

Search of the carlton reserve for laundrie. the next day, human remains are found in a remote location near grand teton national park. autopsy results confirm the remains found are those of gabby petito. the cause of death ruled a homicide. >> that was amara walker. thank you, amara for that. now more on our breaking news tonight. the big development in the case of gabby petito, the fbi saying a federal arrest warrant has been issued for her fiance, brian laundrie, related to his activities after petito's death, which has been ruled a homicide. this happening as investigators are still searchi...

Account. it was the next day, on august 26th, that a woman tells the "san francisco chronicle" she saw laundrie in his van in spread creek, a camping ground near where petito's body was later discovered. >> i'm 100% certain that i did see him parking his van, and it was just him. there was no gabby. >> reporter: a day later, the petito family received what appeared to be the last text message from her. petito mother found the text odd, telling police she never called her grandfather by that time. that same day a louisiana couple says they saw petito in tears and laundrie visibly upset during a...

>> reporter: the next day the petito family received the last text message from petito's phone but they're skeptical it came from her. quote, no service in yosemite. according to police, laundrie suddenly returned to the north port, florida home he shared with petito and his parents but without petito. a neighbor said she last saw laundrie outthe family home the weekend of september 10th. >> i thought it was a normal they were going for a walk kind of thing. so never thought anything about it. >> reporter: it's the same weekend petito's family report her as missing on september 11th. the laund...