My Son Lost,his Computer Privileges And He Is Threatening To

My son lost,his computer privileges and he is threatening to kill himself. I'm not sure what to do. He is hitting my husband and throwing a tantrum. He said the computer is his life. We took all his computers and phones and he just,want to die he says. We have had three melt down since Christmas about this. He still hasn't gotten his privileges back. He has threatened to kill himself three different times how. He is,hoping we just,give in. I think he would kill himself if he was pushed far enough. He had a arrow in his small bow and arrow put it to his head on Christmas and my husband had to grab it from him. What should I do?