An attorney who splits his time between Key West and Utah must face a lawsuit in Texas alleging his letters to Koch Industries ’s CEO defamed a member of the billionaire Marshall family, which owns a 16% stake in the energy and finance multinational.

Lawyer Edwin Hunter argued a probate court in Harris County, Texas, did not have jurisdiction over him since he lives elsewhere. But Houston’s Fourteenth Court of Appeals rejected that argument, listing examples of Hunter advising Marshall family members about legal matters in Texas.