Cody Lumpkin is a 7-4 soulja till da end. Or, in gangster-speak, he’ll be a Gangster Disciple until he dies. That’s how the 21-year-old Athens man shows himself to the world on his Facebook page, replete with photos of him flashing gang signs, posing with guns, bragging about money and disrespecting women. Whether or not he’s a genuine member of the notorious Gangster Disciples street gang, Lumpkin played the part last weekend when, police say, he killed a man with a gunshot to the head. The shooting happened Sunday night at Rolling Ridge Apartments off Kathwood Drive, where Jeremy Sean Buchanan was shot and killed by Lumpkin in an apparent robbery, which police said also was drug-related. “Cody Lumpkin gives every appearance of being a gang member,” said Robert Walker, a nationally-known gang expert who analyzed Lumpkin’s Facebook page Friday. He never directly states he’s a member of a gang, but Lumpkin uses what gang investigator...