A man has been arrested in the early morning shooting death of a California Institute of Technology scientist who was killed on the front porch of his Los Angeles County home, according to law enforcement. Someone called 911 about the shooting at a home in Llano on Monday, February 16, where deputies discovered a 67-year-old man shot and lying on his front porch, the Los Angeles County Sheriff's Department said in an initial news release. Despite attempts to save him, he was declared dead at the scene, authorities said.