Dalhart police said Thursday that Lenora Pruitt did not seek medical help for Cody Freeman.
Sgt. David Conner says Pruitt was charged with murder and bond is $100,000. Jail records did not list an attorney for Pruitt, who was arrested Monday.
Conner says police are investigating why the couple apparently argued June 15 before their sons, ages 7 and 4. Pruitt allegedly hit Freeman in the head with a socket wrench.
Pruitt and the boys were home with Freeman until she found him dead June 22. Police say Freeman apparently had a brain injury but could still move and talk.
The children are with relatives in Clovis, N.M.