You and Halley were friends for years, until last night she was found murdered in a back alleyway, YOU are the detective

Police(in a British accent): Sets files and archives of witnesses, fingerprints, evidence, security camera footage and records 23 year old, Name: Halley. Found murdered in an alleyway; two knife wounds in her back, and a gunshot in her hip. blood’s dry: probably died around 12 hours ago. Eye witnesses say she went in with her boyfriend; never came out.