Tara Grinstead and Ryan Alexander Duke: What we know

After more than 11 years of searching for answers, police announced Thursday that they had made an arrest in the disappearance of South Georgia teacher Tara Grinstead.

Ryan Alexander Duke, who graduated from the same high school where Grinstead taught, has been charged with her murder. He has also been charged with aggravated assault, burglary and concealing a death.

A second man, with a similar last name but no relation to Duke, has also been charged. Bo Dukes, 32, has been charged with helping to conceal a death. The two were classmates at Irwin County High School, where Grinstead taught history.

Few details about the case have been made public because a judge has issued a gag order.

What we know: 

Duke Wasn't on Police Radar: The 33-year-old man was not known to the police and was not considered a potential suspect. The police interviewed multiple people and had hundreds of leads in the case over nearly 12 years. But Duke was not among them.

Duke graduated from Irwin County High School in 2002, three years before Grinstead went missing. Grinstead was a teacher at Irwin County High School, but it is not known if she had any personal or professional relationship with Duke.

Duke's arrest started with a walk-in tip. It is not known who made the tip, or what their relationship is to Duke or Grinstead.

The missing woman's older sister spoke at the vigil.

Police say Duke burglarized Grinstead's home and "used his hands" to kill her. This was revealed in an arrest warrant on Thursday. Warrants also allege Grinstead was killed in her home and her body was later removed.

Grinstead's home was locked, but her car was unlocked when she went missing. There was $100 in her car and clay on the tires. Her purse and keys were missing from the home.

Tara Grinstead

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One of Grinstead's former colleagues remembers Duke as a "polite" former tennis player. Wendy McFarland, an Irwin County High School teacher, recalled Duke as "nice" and "a very bright student." He also reportedly played football.

Police say their investigation is continuing. They expect to interview additional people. They would not say if Grinstead's body has been recovered.