Three surfers who went missing in Mexico were seen enjoying their vacation in their final social media posts before they were found dead.

On Sunday, Mexican authorities confirmed that the three dead bodies discovered in a well in Mexico's Baja California region two days prior were those of Australian brothers Callum and Jake Robinson and their American friend, Jack Carter Rhoad, The Guardian reported.

The three men died from gunshots to the head, according to authorities.

The group was reported missing after they failed to check in on April 28 to the Airbnb they booked in the city of Rosarito.

Callum, 33, had posted photos of his camping and surfing trip with Jake, 30, and Rhoad, 30, in Baja California, Mexico on Instagram before they went off the radar.

Surfers missing in mexico

(Photo : Instagram.com/callum10robinson)

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Some of the pictures shared via Callum's Instagram Stories, and featured on his account's Story highlights, showed the trio at Rosarito Beach.

The final image posted by Callum on April 27 revealed they visited the city of Ensenada. The photo showed Callum, his brother, and their pal sitting on the sand in San Miguel beach, watching the sea.

Surfers missing in mexico

(Photo : Instagram.com/callum10robinson)

One haunting photo showed a white Chevrolet Colorado pickup truck at Rosarito Beach. Alongside the image of the truck at the beach and an emoji of the Mexican flag, Callum wrote, "... and it begins."

The vehicle was believed to be the same burnt white pickup truck found in the Santo Tomás area Thursday, near the site where the men's bodies were discovered.

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Mexican authorities said they believe the Robinson brothers and Rhoad were fatally shot by carjackers who wanted to steal their pickup truck for its tires.

The assailants then allegedly got rid of the bodies by throwing them down a remote well.

Sharing their theory regarding the events leading up to the three men's deaths, Baja California's chief prosecutor María Elena Andrade Ramírez suggested that the perpetrators likely drove by the men's beach camp and saw their pickup truck.

Andrade Ramírez said the Robinsons and Rhoad likely resisted and were shot for it.

A post shared by instagram

"When they tried to get the vehicle, the victims opposed the robbery, the robbers were armed with a firearm and apparently shot the victims," Andrade Ramírez told Australia's 7News.

According to The Guardian, the state's chief prosecutor also said, "They were not attacked because they were tourists, the intent was to steal their vehicle."

Three people have been arrested following the surfers' disappearance, though no one has been charged with murder as of this writing.

The suspects were identified by the New York Post as Jesús Gerardo Garcia Cota, who also goes by the alias El Kekas; his partner Ari Gisel García Cota; and Jesus' brother Cristian Alejandro Garcia.

Ari, 23, had one of the surfers' phones on her at the time of the arrest.

One of the three has since been charged with kidnapping, while the other two face charges for crystal meth possession.

Jesús was believed to have participated in the killings of the Robinson brothers and Rhoad.

Andrade Ramírez did not rule out the possibility that the two others were also involved in the crime.

"In fact, we are sure that more people took part in the attack," she said.

The investigation into the case is ongoing.

Police car representation

(Photo : Pixabay/fsHH)