Authorities investigating the area where the couple's bodies were found on Padre Island, Texas.

The bodies of a missing New Hampshire couple were discovered buried on a beach in Texas — days after their missing RV was spotted crossing the border into Mexico, according to a report.

James Butler, 48, and his wife Michelle, 46, both of Rumney, arrived on Padre Island with their truck and RV trailer Oct. 15 — one of many stops on their cross-country camping trip.

When family hadn’t heard from them about a week later, they reported their disappearances to police, who unearthed a disturbing clue caught on surveillance footage, KZTV in Corpus Christi reported.

The video allegedly shows an unidentified driver behind the wheel of their truck as it crossed the border into Mexico sometime between Oct. 20 and 21.

A week later, on Oct. 27, the Kleberg County Sheriff’s Office discovered human remains on the beach near the Butlers’ camping site, and an autopsy confirmed their identities.

The couple, who have five grown children, took off on a cross-country excursion about a year-and-a-half ago, touring the States and working odd jobs along the way, according to family.

“They were very good at staying in touch with everybody and awesome at sharing their daily adventures,” James’ sister, Deborah Van Loon told the local CBS affiliate in Boston. “He said ‘I’ve never seen the United States’ and bought a used RV.”

It’s unclear how the Butlers died. Police are searching for their truck and investigating their deaths as homicides.