Mountain Lions Moving Into Missouri?

--Chad Love

We know about mountain lions in Kansas so I guess it stands to reason they wouldn't stop at the border...

From this story on the Maryville Daily Forum:
Conservation officials say a mountain lion killed by a cattleman in Ray County was a young male that showed no sign of having been held in captivity. Conservation Agent Tammy Pierson said Bob Littleton went to one of his pastures Sunday night after coon hounds treed a mountain lion where his cattle were grazing. He killed the mountain lion with a shot to the head from a .22-cal. rifle. Littleton reported the incident as required by law. Pierson collected the mountain lion this morning and sent it to the Missouri Department of Conservation Resource Science Center in Columbia, where resource scientists examined it this afternoon

Isolated incident or further proof big cats are slowly returning throughout their former range?