( CNN ) -- A pistol in the hands of a 4-year-old boy went off during a weekend cookout , killing the wife of a Tennessee sheriff 's deputy who was showing his guns to a relative , state police said Monday . No one saw the boy pick up the weapon before the shooting , which occurred Saturday night in Lebanon , east of Nashville , Tennessee Bureau of Investigation spokeswoman Kristin Helm said . The single shot killed 47-year-old Josephine Fanning , the wife of Wilson County Sheriff 's Deputy Daniel Fanning . The couple were hosting family and friends at their house when Daniel Fanning and a relative went into a bedroom to check out some of Fanning 's guns , Helm said . Josephine Fanning and the boy walked into the room later , and at some point the boy picked the loaded pistol up off the bed . Helm said she was n't sure of the relationship between the boy and the Fannings . The TBI , which investigates incidents involving law enforcement officers , is still conducting its probe , and no charges have been filed . The gun involved was Fanning 's personal weapon , not his service pistol , she said .
A gunshot killed the son of a Tennessee sheriff 's deputy . A 4-year - old had picked up the pistol , police say . No charges have been filed , the police say .