William Brock told investigators he shot Loletha Hall because he thought she was working with a man who called and threatened him and his family. Hall did not threaten Brock and did not have a weapon or assault him, according to the sheriff’s office and court documents.
Manslaughter maybe. The old man is the only one who murdered anyone.
Dude on the phone was attempting extortion. When someone dies in the commission of a crime, everyone gets hit with the murder charge.
See:
https://www.themarshallproject.org/2015/09/24/a-person-can-be-charged-with-murder-even-if-they-haven-t-killed-anyone
Felony murder laws vary by state. In Ohio, felony murder does not apply to extortion.