A man from Hermon who shot and killed an intruder in his apartment last year and injured another man is on trial for drug charges. 25-year-old Daniel Williams has pleaded not guilty to aggravated trafficking in scheduled drugs and trafficking in drugs with a firearm. Prosecutors say last February some people went to Williams’ house and bought drugs. The next day 30-year-old Robert Dellairo and 19-year-old Philip McIntyre, both of Bangor, broke into his apartment. Williams says he shot them to protect himself. Dellairo died. The drug case against Williams grew out of the investigation into the shooting. Williams has not been charged in connection with that case.The trial started Tuesday and we’re told Williams is expected to take the stand Wednesday The case could wrap up Thursday.