An officer shot and killed the man, who hasn't yet been named, at the River Glen of St. Charles residence on Sunday, Dec. 1

A man wielding a chainsaw inside a senior-living facility in St. Charles, Illinois, was shot and killed by police early Sunday, state and local law enforcement said. "Just before police arrival, witnesses advised the subject had now gained entry to the lobby of the building and began confronting residents with the chainsaw,

The man, who did not have authorization to be in the Illinois facility, confronted residents while armed with the chainsaw, police said.