William Nelson of Pontiac is once again a free man, after an Oakland County jury Monday found him not guilty of murder, assault with intent to murder and felony firearms charges.Nelson, 20, had been charged with shooting to death Marcus "Merk" Burkett, 23, and wounding Burkett's friend, Kyeire Cowart, then 17, at a house at 59 Thorpe Street where they and a group of others had been partying last July 3.