Petito's family released a statement Tuesday claiming that \"the one person that can help find Gabby refuses to help,\" adding that they \"beg the Laundrie family to not 'remain in the background' but to help find who Brian referred to as the love of his life.\"

\"Brian is refusing to tell Gabby’s family where he last saw her,\" the Petito family said. \"Brian is also refusing to explain why he left Gabby all alone and drove her van to Florida. These are critical questions that require immediate answers.\"

The FBI and agencies in Utah and New York are also participating in the investigation.

ABC News' Alexandra Faul contributed to this report.

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