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The body of his fiancée Gabby Petito was found in Bridger-Teton National Park on Sunday (19 September), but his whereabouts is not known.
Police in North Port, Florida, have been searching Carlton Reserve, where he said he was hiking.
Now, Boohoff Law - a personal injury law firm which has an office in North Port - is offering up a reward to anyone who can lead authorities to his exact whereabouts.
In a statement, the law firm said: "A reward will be paid once the investigating law enforcement agency supplies Boohoff Law written verification that a tip helped lead to locating Brian Laundrie.
"The authorized reward will remain open for two months starting from the receipt of the tip by the investigating law enforcement. Only one reward is offered.
"This reward is offered to the first person to supply information leading directly to the exact whereabouts of missing person Brian Laundrie. This reward cannot be split."
#BoohoffLaw is offering $20,000 for information leading directly to the exact whereabouts of missing person #BrianLaundrie, a person of interest in the case of 22-year-old #GabbyPetito.
*Details in website link below.#GabbyPetitoUpdates https://t.co/YQfdW7edfX
- Boohoff Law, P.A. (@BoohoffLaw) September 23, 2021
Laundrie and 22-year-old Petito had been driving around national parks in their van, all the while documenting their trip on social media.
However, Petito's family did not hear from her verbally after 25 August, and they subsequently reported her missing on 11 September.
Laundrie returned to Florida in the van but wouldn't cooperate with police, before his family subsequently reported him missing, claiming they haven't seen him since Tuesday 14 September.
Yesterday (Thursday 23 September), searchers spent a fifth unsuccessful day looking for Laundrie at the Carlton Reserve, with the search set to resume today (Friday 24 September).
It comes after a post-mortem formally identified Petito's body.
In a statement, the FBI said: "Teton County Coroner Dr Brent Blue confirmed the remains are those of Gabrielle Venora Petito, date of birth 19 March, 1999.
"Coroner Blue's initial determination for the manner of death is homicide. The cause of death remains pending final autopsy results."
Following the tragic news, the family of Laundrie released a brief statement offering their condolences.
It read: "May Gabby Rest In Peace."
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