Nichole Schmidt, Gabby's mom, has detailed why she believes a third party was involved in the death of her daughter's killer

Brian Laundrie is believed to have murdered his fiancé during their cross-country road trip

Nichole Schmidt, Gabby's mom, shared her theory while appearing as a guest on Twilight star Taylor Lautner's podcast

Gabby Petito's mother, Nichole Schmidt, has spoken about what she believes happened following Laundrie's disappearance

The harrowing case has gained renewed interest following the release of American Murder: Gabby Petito on Netflix

The new Netflix documentary has reignited backlash towards Brian Laundrie's parents

Gabby Petito disappeared while on a road trip with her fiancé Brian Laundrie before being found dead

Almost four years on from the murder-suicide of Gabby Petito and her fiancé Brian Laundrie, his sister has posted a cryptic Instagram post

The letter makes for an eerie read now we know Brian Laundrie killed Gabby Petito

Netflix's latest documentary follows the 2021 murder of Gabby Petito

Gabby Petito was murdered by her partner, a horror story that is now being told in a Netflix documentary

A witness statement from a man vacationing with his family in Utah, details his encounter with the pair on the side of the road

Gabby Petito's story is particularly heartwrenching

Gabby Petito's dad and stepmom took several items from the van before deciding what to do with it

The victim's voice has been digitally recreated to hear her story through her own words

Brian Laundrie murdered his fiancé Gabby Petito in 2021

Gabby's parents have taken steps to prevent future victims of domestic abuse

Brian Laundrie made several phone calls to his parents on August 29, 2021

Gabby Petito disappeared in 2021 while on a road trip with her fiancé Brian Laundrie

Gabby Petito was murdered by fiancé Brian Laundrie in the summer of 2021

The family have said they are trying to move forward now

The new Netflix documentary American Murder: Gabby Petitio looks into her murder in 2021

The case sparked international headlines almost four years ago

A harrowing letter was penned by Gabby Petito addressed to her boyfriend before she died