JOLIET, Ill. (MCT) — A fleece jacket worn by Christopher Vaughn on the day his family was fatally shot and he was wounded had been wrapped around a handgun when the weapon was fired once, a police ballistics expert testified Thursday.

Jurors in Vaughn’s quadruple-murder trial in Joliet, Ill., have already heard plenty about the black-and-tan Stormtech jacket, including testimony that the Oswego, Ill., father fretted over how paramedics treated the garment when they took him to the hospital.