[crux_]

Then you say you saw A shoot B. What you don't say is that A is a murderer.

(Note: I really despise the use of the word "actors" in the article, though. It's less wordy than "alleged theives" or whatever, but it could also have been omitted entirely. "The two actors" ---> "The two" etc.)

[TheSOB88]

Why? A is a murderer.

[crux_]

How do you know? A could be mentally ill, and thus innocent. A could be an undercover officer, or shooting in self defence against a threat you didn't see. And so on.

You can say "in my opinion, A is a murderer" -- but the only time you should be making a statement of fact on A's guilt is after it has been proven beyond a reasonable doubt.

To do otherwise is to dishonestly masquerade your opinion as fact and to expose yourself to a nice fat libel lawsuit along the way.