Cobb County Police Chief Tim Cox will host an 8 p.m. press conference on Thursday evening, in reference to an arrest of a suspect from the triple homicide on July 3 at the Pinetree Country Club, in which pro-golfer Gene Siller was killed, according to Cobb County Police.Cobb County Police Chief Tim Cox will host an 8 p.m. press conference on Thursday evening, in reference to an arrest of a suspect from the triple homicide on July 3 at the Pinetree Country Club, in which pro-golfer Gene Siller was killed, according to Cobb County Police.