An Air Force instructor pilot died Tuesday after the ejection seat of the plane he was in activated while the aircraft was on the ground, Sheppard Air Force Base in Texas said.

Capt. John Robertson of the 80th Operations Support Squadron was seriously injured in the incident at the base Monday and died Tuesday morning, base officials said in a statement.

The ejection seat of the T-6A Texan II aircraft went off when he was inside, the statement said.

The T-6A Texan II is a single-engine,…