Deny the convincer

(This story contains gore, sexual references, and a few triggering topics. Be warned)

The camera showed the man walking in an ally. That was all that was shown...no sound at all.
When finding the body, there was a few stab wounds.
A detectives job is to find who the criminal actually is. To see who is alive and dead, to see who is innocent in guilty.
But who's to say the ones who commit the crime, are the only ones hiding a secret?
(W.I.P STORY)