If my brother were murdered it would be a conflict of interest for me to be on the team chasing suspects.
Under our legal system, this man is a suspect, he is guaranteed by our laws his day in court to face charges against him.
Lynch mobs went out with the KKK but some folks appear to want to bring them back.
The only evidence they have right now is circumstantial evidence. If they have given up looking for other possible suspects, they are not doing their jobs.