Brian Laundrie’s father tore down a sign protesters left on his lawn next to a large photo of Gabby Petito at his Florida home over the weekend.
Chris Laundrie, 62, was seen ripping down a yellow sign reading “What if this happened to Cassie?”, a reference to his daughter and Brian’s sister.
Cassie Laundrie in an interview last week, admitting she did not know if her parents were involved in the disappearance of Brian, who has been missing for more than a month.
"I would tell my brother to just come forward and get us out of this horrible mess,” she said.
Ms Petito’s body was found on September 19, five days after Mr Laundrie vanished from his family’s Florida home for a hike.
He hasn’t been seen since, with authorities spending the past month searching the sprawling Carlton Reserve, where 23-year-old Mr Laundrie was last seen.
Chris said he would leave his North Port house and join the manhunt for his son 10 days earlier, although it’s unclear if his contribution aided the search.
He declined to answer questions from a reporter last week as he mowed the lawn around a makeshift memorial set up for Ms Petito, who once lived with the family in the modest, three-bedroom home.
Chris and his wife Roberta, Brian’s mum, have largely been holed up in the home, which has had a constant presence of protesters and reporters since Ms Petito was reported missing on September 11.
Brian vanished shortly after Ms Petito was reported missing, two weeks after he returned to Florida alone in his girlfriend’s van.
The couple had been travelling across the US in the van, with Ms Petito documenting their roadtrip on social media.
Ms Petito’s body was found in Grand Teton National Park on September 19 after a desperate ground and air search in Wyoming.
She had been strangled to death, the medical examiner determined last week.
Brian Laundrie hasn’t been accused of being involved in Ms Petito’s death, but remains the sole person of interest and faces an arrest warrant for debit card fraud.