"Monster In the Shadows," a Peacock docuseries that explores the disappearance of 19-year-old Brittney Wood and reveals a tangled web of family secrets including an alleged sex-trafficking ring, is coming to Oxygen, as well as Peacock special "The Murder of Gabby Petito: Truth, Lies and Social Media." 

Police in Moab, Utah stopped Gabby Petito and Brian Laundrie weeks before she disappeared after a witness reported seeing him hit her. 

"They are incredible,” Nichole Schmidt said of people who spent countless hours on her daughter’s case from their computer screens at home. “The sleuths, the internet sleuths, they do a great job. They really do.”

For more than a week, investigators and internet detectives tried to figure out what happened to 22-year-old Gabby Petito before her body was found in Grand Teton National Park on Sept. 19.