Rigo Cisneros, a 40-year-old former army medic, was on the scene following the College Station, Texas shooting near Texas A&M University on Monday, and he was eager to help.
But by the time police allowed Cisneros join the response team next door, where police say his neighbor, Thomas Alton Caffall, fatally shot Chris Northcliff, his landlord, and Brazos County Constable Brian Bachmann, it may have been too late to do anything.
"There were no vital signs on the constable when I got there," Ciseneros told the Bryan-College Station Eagle. "He took one clear gunshot wound to the chest."
This chilling video, shot by Cisneros on his mobile phone, captures police securing Caffall's house. Caffall allegedly opened fire on police who arrived at his home to serve him with an eviction notice, hitting civilians too. The suspect was shot several times in the ensuing shoot-out and later died at an area hospital.
Cisneros told the The Huffington Post that Caffall asked him to "apologize to the officer who was shot" as he tended to his wounds.
Caffall's mother, Linda Weaver, told The Huffington Post that her son, who was unemployed at the time of the shooting, had "difficulties" with his mental health within recent years.