brian laundrie
Laundrie, the only person of interest in his girlfriend Gabby Petito's death, remains wanted for bank fraud.
"Come forward," Cassie Laundrie urged her brother, the subject of a US search since the discovery of fiancée Gabby Petito's body.
The disappearance of the van-life blogger became an overnight internet obsession.
The message left her mother concerned, the newly released documents state.
Remains matching Petito's description were found in Wyoming, US, on Sunday.