Harrisburg man barred from withdrawing guilty plea in fatal ambush robbery Updated Dec 24, 2020; A Harrisburg man who committed a fatal ambush robbery in league with two teens cannot withdraw the guilty plea that netted him a life prison sentence, a state Superior Court panel has decided. Demetrius Aquino was 18 in August 2017 when police said he shot and killed Dion Walker during the holdup in Swatara Township. The guilty plea he entered nearly two years later to second-degree murder surprised prosecutors. Demetrius Aquino On appeal, Aquino, now 22, claimed Dauphin County Judge Richard A. Lewis should have allowed him to withdraw that plea, even after he admitted to shooting Walker with a .45 caliber pistol and received his life prison term.