What happens next:

You have sentenced the wrong person to be trialed with zero evidence to back up your statement. They are later released with no charges.

You have been stripped of your title of detective and been relieved of all your duties. You must now find new employment

You now have no idea on who committed this crime, and with no evidence or job, it doesn't look like you ever will. The thief and the murderer have now gone free. You better have eyes on the back of your head in case any accidents come your way.