Father of US teen detained in Rome for murder of a carabinieri visits son in detention Ethan Elder, father of Finnegan Lee Elder arrested in Rome over the killing of an Italian police officer, arrives at the building where his son is being detained. Finnegan Lee Elder has confessed to stabbing officer Mario Cerciello Rega, 35, with a US Marine partially-serrated, close-quarters combat knife, according to police. IMAGES