Border Patrol pallbearers carry Border Patrol agent Rogelio Martinez to a graveside service at Restlawn Cemetery, Saturday, Nov. 25, 2017 in El Paso, Texas.
Both agents were airlifted to the hospital, where Martinez died.
Agent Rogelio Martinez's body was found on the side of a busy roadway near the Mexican border outside El Paso, Texas on November 18. He also theorized that the agent's could have been sideswiped by a passing vehicle. Martinez also had broken ribs and a clavicle.
But the Federal Bureau of Investigation findings include previously undisclosed details about the moments immediately after the agents were injured and Garland radioed for help. According to the FBI, Garland told a dispatcher, "We ran into a culvert".
Garland has said he has no memory of how they were assaulted.
Authorities appear ready to rule out the possibility that Martinez and his partner were attacked or ambushed.
Earlier this week, Trump called on Democrats to "get tough" on immigration, citing the death of Indianapolis Colts linebacker Edwin Jackson, who was killed in a suspected drunken-driving crash involving a Guatemalan citizen living illegally in the U.S. Manuel Orrego-Savala was charged Wednesday with two counts each of causing death while driving intoxicated and leaving the scene of an accident.
Then late Wednesday, Emmerson Buie Jr. special agent in charge of the FBI's El Paso office, which led the investigation, released a blockbuster statement: "To date none of the more than 650 interviews completed, locations searched, or evidence collected and analyzed have produced evidence that would support the existence of a scuffle, altercation, or attack on November 18, 2017". It said it had conducted 650 interviews and 26 searches in Texas and New Mexico. One of them, Rogelio Martinez, died of his wounds.
No other suspects have been linked to the incident.
"It says that there is no evidence pointing it to being a struggle", Mr. Cabrera said in an interview.
A Customs and Border Protection spokesperson declined to comment on the case.
The manner of death is undetermined.
The autopsy report noted that a barbiturate was found in his system. The drug is often combined with aspirin or acetaminophen to treat headaches and pain.
"Our view hasn't changed".
Chris Cabrera, a spokesman for the National Border Patrol Council, said the union disagreed with the findings layed out in the internal memo and the FBI's account. "I honestly believe they will", he said.
The union was quick to say the agents were attacked after the incident. Some Republicans, including Texas Sen. Ted Cruz and others.
And President Donald Trump said the injured agent had been "brutally beaten" as he called again for the construction of a wall between the United States and Mexico. "You couldn't make him take anything", Ochoa said. However, none of them were considered a person of interest in the agent's death or the injuries to his partner.
"I find it hard (to believe) that a fall could have caused all the damage that he had", she said.
"But from what I know and see, that was not the case here".
Garland has remained out of the public eye.
Another agent, Stephen Garland, was also found injured nearby with serious head injuries and other trauma. "Our view is he was attacked", he told CNN, referring to the FBI's investigation.