Police say a 22-year-old driver tried to leave the scene after a head-on collision in Pleasant Grove early Sunday.
DALLAS, TX— A witness chased and tackled a man who police say tried to run from a deadly head-on crash in southeast Dallas early Sunday, after a collision near Military Parkway and North Jim Miller Road left two men dead and the suspect facing intoxication manslaughter charges.
Authorities say the case now centers on whether alcohol played a role in one of the deadliest kinds of street crashes, a head-on collision on a major Pleasant Grove intersection. Police identified the suspect as 22-year-old Isaac Chacon and said he was booked on two counts of intoxication manslaughter and two counts of collision involving death. One victim has been identified as Adrian Marshall, while the second man had not been publicly named as of Monday. Investigators have also sought blood test evidence as they continue to build the case.
Dallas police said officers were called to the crash at about 2:09 a.m. Sunday near North Jim Miller Road and Military Parkway. Investigators say Chacon was driving a pickup truck when it collided head-on with a blue sedan carrying two men. One of the sedan’s occupants died at the scene. The other was taken to a hospital, where he later died. In the minutes after impact, police say, Chacon got out and tried to leave. According to reporting based on the arrest affidavit, two people who saw the aftermath stepped in. One woman called 911. A male witness followed Chacon first by car and then on foot, caught him and held him until officers arrived. A nearby resident, Sherry Bowers, said the force of the crash was so strong she heard it from several blocks away. “It was exactly 1:57 in the morning when he hit,” Bowers said.
Television video and witness accounts from the scene showed a wreck so violent that one of the vehicles was badly mangled. A gas station employee who filmed part of the response told NBC 5 that the scene was devastating. “It was bad,” the employee said, describing a victim being taken away on a stretcher and another man pinned down on the roadside in handcuffs. Police have said Chacon was stopped by witnesses before officers took him into custody. Court and police records cited by local outlets say officers noted signs that led them to pursue a blood draw warrant, though the test results were still pending Monday. One local report said Chacon told officers he had consumed only one beer at a party before driving. Police have not publicly released a full narrative of the moments leading up to the collision, including the pickup’s speed, lane position, or whether any surveillance video captured the impact. Those details remain part of the open investigation.
The crash happened in Pleasant Grove, a broad section of southeast Dallas where major arterial roads cut through neighborhoods, businesses and gas stations, making overnight wrecks especially visible to nearby residents and workers. Head-on crashes are often among the most severe roadway collisions because the force of impact is concentrated between two moving vehicles, and this case followed a familiar pattern: a sudden overnight crash, a damaged intersection, emergency crews working in darkness and a criminal case that began within hours. By Sunday afternoon, police had identified Chacon as the suspected driver and announced the charges. By Monday, local reporting had identified one of the victims as Adrian Marshall. The second victim’s name had not been released, a common step while authorities work to notify family. The witness intervention quickly became a central part of the story because it prevented the suspect from leaving before officers arrived and may help prosecutors explain the collision-involving-death counts filed alongside the intoxication manslaughter charges.
Under Texas law, intoxication manslaughter cases can turn on evidence showing that a driver was intoxicated and that the intoxication caused a death. Collision-involving-death charges address the act of leaving, or attempting to leave, the scene after a fatal crash. In this case, police booked Chacon on two counts of each offense, reflecting the deaths of two victims. As of the latest local reports, he remained in the Dallas County jail after his arrest. Some local coverage said no attorney was immediately listed for him, and blood test results had not yet been made public. It was also not clear Monday when he would next appear in court or whether prosecutors would seek additional conditions tied to bond. What investigators are expected to do next is more routine but still important: finish reviewing the crash scene evidence, confirm toxicology findings, complete witness interviews and gather any surveillance or dash camera footage from the area. Those steps will help determine how narrowly the prosecution can reconstruct the minutes before the wreck and the suspect’s actions after it.
Even with the criminal case now underway, much of the story remains rooted in the people who were there first. The nearby resident who heard the collision described a single booming sound strong enough to jolt her awake. The gas station worker who recorded part of the aftermath framed the loss in personal terms, saying the dead could have been anyone’s relatives. “You got to think about others,” he said. “That could have been my brother, that could have been my family too.” The man who chased the suspect has not been widely identified in public reports, but his role has emerged through police accounts and witness descriptions as one of the clearest facts in the immediate aftermath. Instead of watching the suspect disappear into the dark, he followed, closed the distance and held him until police arrived. For investigators, that action may help preserve a direct timeline from the crash scene to the arrest. For the families of the two men who died, the larger case is now moving from a chaotic roadside scene into the slower, documented process of court filings, evidence testing and formal identification.
The case remained open Monday, with one victim identified as Adrian Marshall, toxicology evidence still pending and the second victim’s name still withheld. The next major milestone is expected to be Chacon’s court processing and any release of additional police or court records in the days ahead.
Author note: Last updated April 7, 2026.