Why did someone want Ted and Corey Shaughnessy dead?

When wealthy Austin jewelers Corey and Ted Shaughnessy are attacked by intruders in their own home, investigators initially wondered if it was a robbery gone wrong. The answer was more sinister than anyone could have expected.

source https://www.cbsnews.com/news/ted-corey-shaughnessy-who-wanted-austin-texas-couple-dead-48-hours/