WESTMINSTER, Colo. — A teenager who lived just a mile from a 10-year-old Colorado girl who was abducted and killed earlier this month has been arrested in her death, as well as in a May attack on a runner, authorities said Wednesday.

Police in the Denver suburb of Westminster said they took 17-year-old Austin Reed Sigg into custody Tuesday night after receiving a phone call, apparently from his mother, that led them to Sigg. He was officially arrested Wednesday.