DS Smith was the leading officer in the investigation after Roy and Hayley Cropper informed the police that after Tony Gordon had confessed to killing Liam Connor, he'd also threatened to kill them. Although DS Smith had reassured the Croppers that they'd done the right thing by going to Weatherfield Police Station and giving statements, the couple feared for their safety and were all set to head off to the Peak District, leaving Anna Windass and John Stape running the café, whilst Tony - inwardly panicking that the police were onto him - packed his fiancée Maria Connor off to a health spa for the day and headed into Underworld. There he was arrested on suspicion of Liam's murder and taken to the police station for further questioning.