The Harkey family is very well-known in San Saba County and the pecan farm sits right outside of Harkeyville, a town named in the family's namesake.
Authorities would not comment on a possible motive or weapon used. San Saba County Sheriff Allen Brown wouldn't say how Harkey's body had been concealed but said there were signs of foul play.
"She was taken from the house," the sheriff said. "She had to have been because she couldn't drive herself."
Before he was taking into custody, Bruce Harkey told The Associated Press that Pressley was adopted by the woman's stepdaughter. He said Bonnie Harkey took Pressley in as a teenager and supported him with "hundreds of thousands of dollars" in spending as an adult for purchases including a truck, dozens of new tires and legal expenses.
Through it all, his grandmother continued to support him, Bruce Harkey said.
"Carl ran through money like water," he said. "She's the only woman who ever nurtured, ever cared for him, provided for him, gave him everything in the world that he wanted."
Meanwhile, he said, Bonnie Harkey had declined in health considerably, though she still lived in a home at the family pecan farm. He said she was suffering from dementia and could not recognize him or his wife when he visited her about a month ago.
"We knew that Bonnie was in horrible physical and mental condition," Bruce Harkey said.
He said he saw Pressley last week in San Saba, about four miles west of Harkeyville and 190 miles southwest of Dallas.
In 2006, Pressley was convicted of misdemeanor assault for allegedly choking his estranged wife -- not King. He was sentenced to probation.
His legal troubles mounted: He served multiple jail stints during the last several years for harassment of his uncle, driving with an invalid license and violating probation when he allegedly threatened his mother.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
A local road project more than two decades in the making won't save drivers as much time as many had hoped.
The University of Texas Board of Regents adjourned Thursday without taking action on the job status of embattled UT President Bill Powers.
Longhorns coach Mack Brown talked with reporters Thursday for the first time since reports surfaced this week that he could be stepping down.
Two men were arrested and a third was being sought by police for the shooting death of 47-year-old Russell Martens.
Parking arrangements are a bit different this year at Austin's Trail of Lights, but there are options to suit just about anybody.
After two hours of discussion regarding the final design for Auditorium Shores, the Austin City Council decided to approve the design on a vote of 7-0 with amendments.