Antioch High School Shooting Case Investigative Update

The continuing investigation into Wednesday morning's murder-suicide inside Antioch High School's cafeteria shows that 17-year-old gunman Solomon Henderson fired a total of ten shots from a nine-millimeter pistol within 17 seconds after he entered the cafeteria. Henderson's gun was loaded with nine rounds when it was recovered by police. A pistol magazine loaded with seven rounds was recovered from the cafeteria floor.

No firearms or firearm parts were found during a Wednesday afternoon/evening search of Henderson's Carefree Lane residence.

Detectives have now confirmed that Henderson was brought to school on Wednesday by his mother, not by bus as was believed on Wednesday. The investigation shows that just prior to entering the cafeteria, Henderson went into a nearby restroom where he posted photos to social media.

In the aftermath of the shooting, detectives have found two documents believed to have been created by Henderson on non-traditional websites, one 51 pages in length, the other 288 pages. That material, along with evidence recovered from the residence Wednesday, is under close scrutiny by Homicide Unit detectives, detectives from the Specialized Investigations Division, and the FBI. It is clear that Henderson was significantly influenced by web-based material, especially that found on non-traditional sites that most would find harmful and objectionable. The FBI is working closely with the MNPD in the ideological influences portion of this investigation.

The Bureau of Alcohol, Tobacco & Firearms (ATF) is working closely with the police department to determine the origin of the gun Henderson used and how it came into his possession. At this point, it is known that the pistol was purchased by an individual in Arizona in 2022. It had not been reported stolen. Efforts continue here and out of state to further this aspect of the overall investigation.

Chief Drake extends the police department's deep condolences to Antioch High students, parents and staff. MNPD officers and counselors are working to be a part of the healing process. Persons impacted by Wednesday's tragedy who need counseling assistance, in English or in Spanish, can contact the department's Family Intervention Program at 615-862-7333. The department continues to be in regular discussion with the school system concerning campus and classroom safety, particularly at Antioch High when classes resume next week.

As a reminder, the Security Threat component of the MNPD takes on-line, written and verbal threats against schools and institutions very seriously and works to identify, arrest and prosecute those responsible. Three persons have been arrested today in unrelated threat cases. Those will be detailed in a subsequent media release.