You have to get the one from your window, the shootings. Another one from swan park. Another one by running at night. Another one by talking to the flower lady the first time. Another by spending time relaxing and talking to the guy whom lost his sun, bully the answers from him. I think that's all the clues. Then you investigate the mans appartment before your run, and click it's all connected. Butter up the man that comes in and boom, done.