PITTSBURGH (AP) – Police say a “person of interest” in the fatal shooting of an off-duty Pittsburgh police officer is in custody. A Public Safety Department spokesman on Thursday night said the person is held on charges unrelated to the death of 36-year-old Officer Calvin Hall. The spokesman did not release the charge or the person’s name and would only say the investigation is ongoing. Hall died Wednesday at a hospital after he was shot three times in the back early Sunday during a street dispute as one or more parties were going on. Officials say there was a “strong possibility” that Hall, although off duty, “was in fact acting under the color of the law when he was fatally shot.” His funeral is scheduled for Tuesday.