Sound Thinking
Law Enforcement

Public Safety Success Story

St. Louis County Prosecutors Leverage ShotSpotter Evidence to Secure Murder Conviction

St. Louis
Coverage Area
10.12 SQ. MI
Product Used
Soundthinking Product Logo
Customer Since


On March 24, 2021, police in Jennings, Missouri, arrested 20-year-old Dairius Kinnie after a high-speed chase followed by a brief shootout. Kinnie was arrested on suspicion of having shot and killed his former girlfriend, Tianna Baker, as well as her mother in their home in the northern suburb of St. Louis. Kinnie was charged with Baker’s murder, as well as several other crimes. Prosecutors alleged that he went to the house and shot Baker several times, intending to kill her, and then shot her mother.


To help prove that Kinnie acted with cool deliberation, St. Louis County prosecutors submitted a ShotSpotter audio recording as evidence to the jury. The recording revealed that Kinnie fired his gun in three volleys, with pauses in between, before starting to shoot again. The pauses were enough to demonstrate the deliberation element required by Missouri’s definition of first-degree murder.

The state built its case on the testimony of Baker’s mother, who had survived the shooting, and of Baker’s sister, who was there at the time. They also called upon several police officers and detectives as witnesses. On December 20, 2023, a St. Louis County jury returned a verdict of first-degree murder and four other felonies in connection to the fatal shooting.

ShotSpotter evidence can tell you if there was a gap in the shots, which could indicate something like deliberation, supporting an argument that the second round of shots was to ensure the victim died. In addition, the technology can lead to a faster police response, making it easier to ensure the integrity of the scene, locate witnesses, and preserve and gather evidence.

Wesley Bell
St. Louis County Prosecuting Attorney
How Shotspotter Benefits St.Louis County
Reduces Response Time
ShotSpotter immediately alerts police to gunfire, enabling officers to be on scene quickly to render aid, interview witnesses, and gather evidence to hold offenders accountable.
Stronger Community Relations
Faster response times helps build trust and improve the relationship between the St. Louis PD and the community.
Improves Evidentiary Data
ShotSpotter’s Detailed Forensic Reports provide audio gunfire data that prove to be invaluable for district attorneys, prosecutors, and juries in understanding shooting incidents.

To learn more about our SafetySmart Platform, click here

All rights reserved ©2024. The SoundThinking logo, the ShotSpotter logo and the SafetySmart logo are registered trademarks of SoundThinking. Inc.