Bystander Johnny Langendorff watched as Devin Kelley traded gunfire with a neighbor who had grabbed his own rifle and engaged the gunman as he tried to flee the scene at First Baptist Church.
"I pulled up to the intersection where the shooting happened and I saw two men exchanging gunfire," Langendorff said, according to the San Antonio Express-News. "The other gentleman said we needed to pursue (Kelley) because he shot up the church. So that's what I did. I just acted."
The pair followed Kelley until he lost control of his vehicle and ran off the road. Authorities were there moments later, according to KSAT.
It is still unclear if Kelley was shot by the armed resident or if it was self-inflicted.
The Associated Press contributed to this report.
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