An individual shot someone, unless you think multiple people were helping pull the trigger.
An analogy is Enrique Tarrio's arrest in the wake of January 6th. Right wingers complained that he wasn't even in the capital during the riot. But of course that's not evidence his innocence. Even though he didn't personally participate in the putsch, he was still held responsible for organizing it (not for long on account of his pardon, unfortunately, but he was still rightfully convicted).