The study advanced knowledge of sexual offenders by incorporating data from criminal justice system records ("detected" criminal offending) with data from newly tested SAKs that were not previously adjudicated ("undetected" sexual offending). The findings indicate that the sexual offenders identified from SAKs had extensive criminal histories and often continued to offend after the SAK-associated sexual assault and were likely to have criminal histories that did not include a prior arrest(s) for rape. A latent class analysis identified three classes of offenders based on their offending history, "High-Volume Generalists," "Low-Volume Offenders," and "Sexual Specialists." Most were generalists, with a large proportion committing many serious crimes. 4 tables, 1 figure, and 49 references (publisher abstract modified)