In a story I’m working on, the protagonist is a woman whose husband told her (before their marriage) that, prior to their acquaintance, he had committed the crime of rape but has reformed. As the story opens, about four years into their relationship, they encounter a woman who is so discombobulated by the sight of the husband as to go into an immediate panic; this woman was one of his victims, and when the protagonist, later, learns the specifics of the assault, she is gravely shaken, though she honestly believes her husband has reformed.
For purposes of this story, I want the assault to question to have taken place long enough ago so that the husband cannot possibly face prosecution for his crime. As I understand it, in Tennessee, the statute of limitations for rape is eight years, while for aggravated rape is fifteen years. But I’m not clear on the difference between the two crimes. Is this a common-law thing or a legislative thing? Can anybody point me to a good resource?