CORPUS CHRISTI, Texas (CBSDFW.COM/AP) — Police have arrested a man in Mexico who’s suspected of stealing a car that belonged to the New Hampshire couple found buried at a South Texas beach last week, authorities said.

Kleberg County Sheriff Richard Kirkpatrick told a local news station in Corpus Christi that Adam Curtis Williams was arrested by authorities in the Mexican state of Jalisco on felony theft charges Wednesday.

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Adam Curtis Williams (Kleberg County Sheriff’s Office)

Authorities believe the 33-year-old Utah native and Amanda Noverr might have had contact with 48-year-old James Butler and 46-year-old Michelle Butler before they died. They released a surveillance photo of Williams and Noverr crossing the border into Mexico in the Butler’s car.

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James Butler’s sister, Debbie Van Loon, told a New Hampshire news station that they were “glad to hear the arrest has been made and await what’s next.”

Officials said the Butlers’ deaths are being investigated as homicides.

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