A deputy with the Comal County (TX) Sheriff's Office died Thursday evening after a crash on FM 3009.

According to a statement released by Schertz Police Department, officers were dispatched at about 5:15 p.m. to the intersection of FM 3009 and Dimrock for a major accident involving three vehicles. Preliminary investigation showed Comal County Sheriff Transport Deputy Ray Horn, 44, possibly suffered a medical emergency while driving, which resulted in the accident.

Horn had reportedly just completed agency-required physical fitness testing.

Horn was transported to a nearby hospital and was pronounced dead shortly after arrival, the Herald-Zeitung reports.