A Taylorville man convicted of molesting a young girl was sentenced to more than six years in prison Monday - and could spend the rest of his life behind bars if found guilty of an additional charge.

David Michael Olsen, 40, was convicted of first-degree sexual abuse by a 12-person Clatsop County Circuit Court jury Friday following a four-day trial. Olsen sexually molested a 5-year-old girl in the summer of 2003.

Judge Paula Brownhill sentenced Olsen to six years, three months in prison, the minimum required under Ballot Measure 11.

The jury acquitted Olsen on another sex abuse charge and deadlocked over a third, all of which involved the same victim. Chief Deputy District Attorney Ron Brown said prosecutors planned to seek a new trial on the third count. If convicted on that charge, Olsen could face the possibility of life in prison without parole, under a state law that allows a life sentence for those with three felony sexual abuse convictions.

Olsen was convicted of felony sex abuse in Clatsop County in 1986. He was convicted of a misdemeanor sex crime involving a juvenile in Clark County, Wash., in 1993.

The victim of the 1986 crime, who was 7 years old at the time, was brought in from Oklahoma to testify against Olsen last week, because the circumstances of that incident and the latest crime were so similar, Brown said.

Olsen received only three years' probation for his 1986 conviction, which came before the minimum sentences imposed by Measure 11, and was given no sex offender treatment, Brown noted.

"It's amazing how differently we do things now versus how we did things then," he said.