"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". Disoriented and unsure of his location, Garland told the dispatcher that he and Martinez were injured.
"Border Patrol Officer killed at Southern Border, another badly hurt".
"The second Border Patrol agent also made a statement to the effect of, 'We ran into a culvert, ' 'I ran into a culvert", or 'I think I ran into a culvert, ' " the dispatcher said.
The incident happened beside Interstate 10 near the town of Van Horn, about 120 miles southeast of El Paso and about 30 miles across rugged desert from the Mexican border.
Sen. John Cornyn, R-Texas, who promised Martinez's mother that his attackers would be held accountable, acknowledged Thursday that the death now appears to have been an accident, according to the Texas Tribune.
The FBI says its investigation is still open into the death of Texas Border Patrol agent Rogelio Martinez, and it is still offering a 50-thousand dollar reward for information that leads to a determination of what happened.
"We will seek out and bring to justice those responsible", Trump tweeted. "We will, and must, build the Wall!".
A Customs and Border Protection spokesperson declined to comment on the case.
The FBI and the state of Texas have offered a $70,000 reward for information in this case.
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The U.S. Border Patrol agent whose mysterious death last fall sparked a political firestorm apparently crashed his vehicle into a ditch shortly before he was found with traumatic head injuries, federal officials said Wednesday.
The FBI opened an investigation into a possible assault on a federal officer after Rogelio Martinez and his partner, Stephan Garland, were injured while on patrol in a remote area off Interstate 10 near Van Horn in West Texas the night of November 18.
He pointed to the lack of injuries on the lower part of Martinez's body. "The FBI is still keeping jurisdiction, and last time I checked, the FBI doesn't investigate traffic accidents".
Ochoa said the Federal Bureau of Investigation is focusing on the medication in Martinez's body instead of finding the person who killed him.
"The FBI had identified two persons of interest, but through forensic analysis both have been determined not to have had anything to do with the death of Agent Martinez and the injuries to his partner", according to the statement. His evidence comes from his own "investigation" into the scene of the incident.
Culberson County Sheriff Oscar Carrillo, who responded that night, said it didn't look like an attack to him. Investigators also talked to six employees of Union Pacific Railroad, which had locomotives in the area.
The president later added that Martinez's partner, who was injured and hospitalised but survived, had been "brutally beaten".
The FBI statement follows an inconclusive autopsy report released by the El Paso county medical examiner's office on Tuesday which said the death was caused by blunt force trauma from an undetermined cause. An indictment is merely a charge and should not be considered as evidence of guilt.
In the more than two months since Martinez's patrolled the West Texas desert for the last time, the Federal Bureau of Investigation interviewed hundreds of people, combed through cellular data and analyzed DNA from the scene.