I've searched the printed sources I have and I've not found any of the names you mention. One statement I did find was that only one McMullen family settled in Webster County. Look in San Angelo County TX. I didn't find any of these people in the cemetery books either. Sorry. Good luck.
None of these names are in my family tree. However, I looked in the Webster County History book that I have and I find a Will Bailey married Lou DeShazio and they are both buried in San Angelo, TX. No dates, no other information.
There is also a J. T. Head buried at New Hope Cemetery.
The best place to look for the murder would be in old newspapers. They would probably be on microfiche at the Dept. of Archives in Jackson. I've been searching for a murder in my family too. I know who the victim was, who the perpetrator was, and the exact date and so far have found no mention of it anywhere.
I will search the McMullen information in the Webster History but it is more extensive and will take me a little time. I'll get it back to you ASAP. I've got to buy groceries today or I'll be joining my dead relatives due to starvation.