His body was found on a riverbank on Saturday with gunshot wounds to the head, according to the Washington County coroner, Brian DeClue, who called the death a homicide.In an interview, he said that Mr. Ancona, 51, was killed with “a shotgun of some sort.” Jerrod Mahurin, the prosecutor in the case, said Mr. Ancona was also shot in the head with a 9-millimeter handgun.On Monday, Mr. Ancona’s wife, Malissa Ancona, 44, and stepson, Paul Jinkerson Jr., 24, were charged with a range of crimes in connection with the killing, including first-degree murder and the abandonment of a corpse, according to the St. Francois County Sheriff’s Department.