Mine died...on Father’s Day 2001. Never did reconcile issues.
That’s a tough one. But prayer helps, even after the person is gone. Ask God’s help to heal the relationship, make your places of innocence clear to you, as well as your areas of repentance, and ask God to help you experience forgiveness. Sometimes it’s hard to forgive when the person is gone, but it’s more for your benefit than for his.
Mine died that same day. We never resolve issues, too deep to resolve. Bless you.