The man suspected of killing Auxiliary Bishop David O’Connell in his Hacienda Heights home pleaded not guilty at an arraignment hearing Wednesday. Carlos Medina, 61, has been charged with one felony count of murder and a special allegation that he used a firearm. During the arraignment at Foltz Criminal Justice Center in downtown LA, Superior Court Judge Armenui Amy Ashvanian ordered that Medina remain in jail in lieu of $2 million bail…