Duke was a 2002 graduate of Irwin County High School, where Grinstead taught history. But details about the relationship between the two have not been released.
Grinstead, 30, was last seen on Oct. 22, 2005, when she left a cookout and said she was going straight home. Two days later, she was reported missing when she didn’t show up at work.
Investigators now believe Duke killed her in her home and then moved her body to another location, possibly a farm in neighboring Ben Hill County.
A second man was later arrested and charged with concealing the death of south Georgia teacher Tara Grinstead, according to arrest warrants. Bo Dukes, 32, allegedly helped Duke “conceal and destroy” Grinstead’s body. Dukes is not related to Duke, but the two were high school classmates.
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