First, do NOT discuss any more facts about this case ANYWHERE on the internet, because anything you post can be used in court. 4 people can be responsible as conspirators for the same crime. Best to speak with an experience local attorney in the area who can sit down with you and discuss this matter in a priviledge setting.
I will be happy to speak with you at no cost with a FREE phone consultation if you have a San Diego or California matter. Please call my office at 619-238-1905 or visit my website at www.lawofficeofwilliamdaley.com
All can be charged if they all acted in concert with one another. Did each have the intent to commit the crime and did each say or do something to assist in the commission of the crime? If so, they can be charged and possibly convicted.
They need good representation.
William Daley is correct. Do not discuss the specific facts of this case with anyone else, except an attorney who is experienced in criminal defense and has done murder defense cases before. Everyone can be charged as conspiracy, which carries the same penalty as the actual act itself. You should retain someone to investigate the case, and develop facts that will assist in your defense.