I can identify with him. He is fortunate that they were close. Maybe it's best that he is with family now. I'd just.be there for him any and every way you can. Encourage him and get him involved in healthy activities that will keep him from dwelling on that which he can't change.
One thing that might help, Poisetta, is asking him for help fixing or building something simple for you. Show genuine love and appreciation. At the same time, ask him for spiritual leadership and provide him with opportunities to pray and read the Bible, take you to a good church. This hurtful event might turn into a blessing in disguise.
When my Dad's life was taken from him by a health "care" employee, it was devastating. My health went down hill suddenly and no family seemed to care. If it weren't for the Lord, I'd be alone. All of my friends avoided me too. However, I learned from the experience. I could have died, but the Lord spared my life. He was always there, and the Holy Spirit comforted me.
I hope that your Dad heals soon and gets saved through this. For details, just ask anytime.
Prayerful for your Dad,
Health and Happiness
PS:
When someone is struggling, it sometimes takes others to help get their feet back on the ground. I'm glad you are there for him and asking us for prayer.
🙂🙏