Hard-line hitchhiker went too far.

Carl Coltellino, his wife, and two daughters were traveling in an RV from Cape Coral, Florida, to Grand Canyon National Park. En route, they stopped in a Wal-Mart parking lot in Cedar City, Utah, to spend the night. At about 9:47 p.m. on July 25, a man knocked at their door.

Thinking that the man was a security guard, they opened their door. The man, Steven Stubbs, was not a guard, and he pushed his way into their motor home. The Associated Press reported that Stubbs told the family that he wanted "to go South." And he refused to leave. The Coltellinos reported that they "tried shoving" Stubbs, and they "tried screaming" at him, but he wouldn't allow himself to be budged from the RV.

During the altercation, Stubbs allegedly began choking Carl and grabbing for Carl's gun, and so Carl shot Stubbs in the head, killing him. It is speculated that Stubbs, who has had a series of minor run-ins with the law, including several alcohol-related incidents, was intoxicated and wanted the Coltellinos to drive him to Florida where he had been attending law school, reported KUTV.com.

After a two-month investigation, the County Attorney's Office decided not to file charges. County attorney Scott Garrett said, "The law allows for one to defend himself, his family and his property under circumstances where one reasonably believes that unlawful force is about to be used against them."