HARLINGEN — A body found in an irrigation canal Sunday morning is a case of murder, police said.

The victim, an adult male, appears to have been shot at least once. Police have a possible identity, but they haven’t confirmed it.

Today, three suspects are in custody, two of them expected to be charged with murder.

The case started about 4 a.m. Friday morning when witnesses heard people arguing inside a late model Ford pickup truck in the parking lot of the Best Western Hotel at 4317 S. Expressway 77.

As the truck was leaving the lot, the witnesses heard a gunshot and saw a muzzle flash.

About four hours later, a pickup matching the description of the suspect vehicle was found burning on a canal bank in a farm field off of Wilson Road, just west of Bass Boulevard. It was a late model Ford F150 four-door truck.

An intensive investigation ensued involving Harlingen police, sheriff’s deputies and state and federal law enforcement officers, Police Chief Jeffry Adickes said.

That led to the arrest of three people Saturday night, two men from Primera and a woman from Brownsville.