Caddo Parish Sheriff's investigators are probing a possible homicide that happened last night in Vivian. Deputies were called to the 300 block of Lowland just after 8 p-m after witnesses reported hearing a gunshot. When they got there they found a black male, believed to be in his 30s, lying in his back yard with what appeared to be a gunshot wound to the uper part of his body. He was pronounced dead at North Caddo Hospital.