The in-laws of NASCAR driver Jimmie Johnson and the 11-year-old nephew of his wife were killed in a fatal shooting in Oklahoma on Monday night that police are now investigating as a possible murder-suicide, according to law enforcement. The Muskogee Police Department said in a statement obtained by Fox News Digital that three people were found dead inside a home on Monday night after receiving a 911 call at around 9:05 p.m. over reports of a disturbance and someone with a gun. According to law enforcement, the female caller hung up after reporting the incident. Once on the scene, police...