honoring son that was killed by fixing his truck

My name is Lucinda Johnson. My son Jamie Johnson(19) was in his truck out driving to the store with his friends and his girlfriend. When six kids decided to cut them off in the attempt to rob them. They got out and started shooting at his truck. When was backing up trying to get everyone out of there, He turned around looking back and was shot in the back of the head. He was pronounced dead minutes after arriving at the hospital. This is my son's truck. It was shot up pretty bad and the inside is ruined with his blood and from rain because the police left the windows down the whole time they had it. I would like to get it back running and have everything fixed that was messed up. This is all I have left of my son.  He loved this truck, it was baby. I would like to take care of his baby for him just like he would want me to. I love and miss his so much.