The person you are looking for that was killed by a knife was John Hart's Brother "Daniel", who John named his son after.
Daniel (his son) did have a daughter who stayed in NJ to live when Daniel moved to Va.-WV. I am from that line of Daniel and have lived in the Elkins area as a child and go to the Hart Family Reunion every year in Beverly WV, as close as we can get to July 4th every year. There is a bunch of us Harts still living in WV area. If I can help you out Please feel free to contact me at: WVridgerunner@gmail.com
I am Steven Hart, John Hart was my 6th GGF and Daniel is my 5th GGF.
Thank you for your reply.