On October 15, 2025, a crash on westbound Interstate 10 near Texas 46 in Boerne, Texas, left Bradly Dietert, 40, dead at the scene. Boerne Police said the pickup he was driving struck the rear of an 18-wheeler that was stalled in a travel lane. Investigators noted preliminary witness statements indicating the tanker truck had no rear lights or hazard flashers activated until seconds before impact. A section of I-10 was closed for several hours while authorities worked the scene. The investigation is ongoing with assistance from Texas DPS.
What Investigators Will Focus On
Disabled truck conspicuity and warnings. When a tractor-trailer becomes disabled in-lane, visibility measures are critical. Investigators will assess whether hazard lamps were activated in time and whether additional warning devices (triangles/flares) and reflective conspicuity tape would have alerted approaching traffic sooner. These findings go to the heart of underride risk and rear-impact severity in tractor-trailer crashes, issues discussed in underride collisions.
Mechanical or electrical failures that disabled the rig. Police cited a possible electrical or mechanical failure before the crash. The reconstruction will examine lighting circuits, battery/alternator output, and any fault codes alongside brake air systems and driveline condition. If the failure should have been caught earlier, that can intersect with maintenance duties and pre-trip inspection obligations for commercial carriers.
Brake and powertrain integrity vs. stopping in-lane. Investigators will determine why the truck remained in the inside lane and whether it could be coasted to the shoulder. They’ll review recent work orders and component histories to see if a known defect progressed to a roadside failure. Patterns tied to brake failure or charging-system faults can elevate liability for the motor carrier or a third-party maintenance provider.
Electronic data and video evidence. Modern tractors may store ECM/EDR data, and some fleets use forward/rear-facing cameras. That material can help confirm vehicle speed, braking, lamp status windows, and the timeline of the disablement. Early evidence preservation—often via a formal request—is crucial because some systems overwrite quickly; see how black box data is used after 18-wheeler collisions.
The points above describe what agencies and experts examine; the official investigation will determine responsibility.
Legal Considerations for the Family
When a loved one is lost, surviving relatives may pursue a wrongful death claim for recognized harms like loss of financial support and companionship. Potential defendants in an 18-wheeler case can include the motor carrier, tractor/trailer owner, maintenance contractors, or component manufacturers, depending on what the evidence shows about lighting, conspicuity, and the underlying mechanical/electrical failure. Families often send a preservation letter promptly to secure ECM data, dash-cam video, inspection logs, and repair records before they are overwritten or lost.
Speak With an 18-Wheeler Accident Lawyer
Crashes involving disabled tractor-trailers raise complex questions about maintenance practices, on-scene visibility, and evidence timelines. If you or a loved one has been involved in a trucking accident, consulting an experienced 18-wheeler accident lawyer can help protect your rights, coordinate expert inspections, and align the civil case with the ongoing police/DPS investigation. Spagnoletti Law Firm handles serious 18-wheeler accidents and can explain the litigation roadmap and available insurance layers in plain English. For comprehensive support across injuries and losses, our personal injury team assists families with medical bills, wage loss, and planning.
Call 713-804-9306 or contact us online for a confidential consultation.