Why did the police station identify the murderer with photos?

This is an identification procedure in investigation measures and a very common measure in criminal investigation. It usually takes 5~ 10 photos to identify suspects through photos. If the old man really can't remember clearly, just tell the truth when he is with someone. There is a procedure to ask the specific situation of the designated person before the appraisal. It's nothing. As for why the warrant should be identified after it is issued, it may be due to procedural problems.