A DuBois man is in jail on homicide charges after police say he shot a man in the head on Thursday over an affair. Glen Chester Johnston, 60, was taken into custody in the Sykesville area after allegedly killing 46-year-old Jude Srock. Police said they were called in and found Srock at around 4:15 p.m. in the area of West Long Avenue and South Franklin Street. He died at the scene. Johnston told police he shot Srock because he was having an affair with his wife. Johnston said he was going to speak to Srock about the affair, but during the conversation he got angry and pulled a gun. He is in the Clearfield County Prison with denied bail. He has a preliminary hearing scheduled for March 25.