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I am terribly sorry for your loss, and the pain it still causes you.
The release of the crime scene photos should have no effect on any future prosecution for the person who attacked your brother and his girlfriend. The security guards are not witnesses and are not going to testify at any trial. If they were to be called as jurors, they would be excused due to having personal knowledge of the crime and being unable to be fair and impartial as a result.
While the release of the photos of an unsolved investigation seems less wise than releasing photos from a case that is closed, and also is somewhat insensitive to your feelings, there is no prohibition against it and it should not have any bearing on a trial should one occur. If the FBI could not use actual crime scene photos for training purposes, the training of the officers and guards who use the photos would be less complete and thorough., to the detriment of all.
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