My son has been charged with open murder and felony firearms. Can you give me a consultation on this? He’s innocent by self defense FOR REAL

He’s never been in trouble a day in his life for anything. He also has a rare and serious heart condition that he has died once from already and caused him to have a pacemaker and defibrillator implanted and he just turned 18. He was robbed by 6 ppl known by the police to be gang members. 3 of them were shot 1 died. There is video records and phone records showing they set him up and then robbed him that’s why they didn’t add 2 attempted murders because they know it’s self defense BUT the city has a bad gang violence problem and the police are incompetent so they are trying to railroad my son to make it look like they are doing something. prosecutor already has been withholding evidence detrimental for him to get through this which were the videos I found out about from an outside source and informed my lawyer pls help me or at least tell me who/where I can report this prosecutor to. The lawyer I had gotten is very old and has COVID so they keep using court back while they have my baby