Assistant Police Commissioner Keith Arnaud provided key testimony in the Yorgen Fenech murder trial, detailing the police investigation into the 2017 assassination of journalist Daphne Caruana Galizia. Arnaud described Melvin Theuma as "completely different" from the "tough guy" he expected, noting Theuma was emotional, broke down in tears, and requested a lawyer from the Nationalist Party camp. Theuma possessed an "ice-cream tub" containing recordings that could assist the investigation. Arnaud explained the police faced a dilemma: they could only use information from cooperating suspect Vince Muscat as intelligence, and arresting Theuma based on hearsay risked court rejection. The strategy was to arrest Theuma on money laundering charges to search for the recordings, a plan approved by Europol.