(Oregon City, OR) -- A 78-year-old violent, repeat sexual offender will spend over 11 years in prison. Dennis Kersting pleaded guilty to sexually abusing a homeless woman in his home in Sandy. She escaped without clothes and ran to neighbors for help. In 2022, Kersting was convicted for strangulation and commercial sexual solicitation. Previously, he served 15 years in prison for killing a 19-year-old prostitute on Thanksgiving Day in 1978. Kersting will be sentenced in February. He won't be eligible for early release.