Remember that rancher who was murdered in Southern Arizona? The guy whose death—presumed to be at the hands of illegal Mexican drug or people smugglers—is widely thought to have inspired Arizona's recent wave of anti-immigrant legislation?

Well, guess what?

The killing of a Southern Arizona rancher that sparked an outcry to secure the border was not random, and investigators are focusing on a suspect in the United States, the Arizona Daily Star has learned.

High-ranking government officials with credible information spoke to the Star, citing a desire to quell the fury over illegal immigration and drug smuggling set off by the shooting death of longtime rancher Robert Krentz on March 27.

They said Cochise County Sheriff Larry Dever is investigating a person in the United States, not in Mexico, in connection with the shooting.

The story is vague and highly speculative and relies on an unnamed source, so grain of salt, etc. But still. If it turns out this guy was killed by an American citizen, then what, Arizona?