A man in Pennsylvania has been accused of fatally shooting a children's hospital nurse in what's believed to have been a random act of violence just hours after he told police he was being followed. Steve Jahn was charged with first-degree murder in the death of Megan Nieberle, the Chester County District Attorney's Office said in a statement shared via Facebook. Officers first came into contact with Jahn, 44, during a welfare check around 8:30 p.m. on Saturday, March 7, outside of a local bank, according to a probable cause arrest affidavit viewed by Law & Crime.