An Omaha teen-age boy has pleaded guilty to killing his ex-girlfriend.
17-year-old Justin Lenz has pleaded guilty to second-degree murder in the choking death of 16-year-old Melanie Koontz.
Lenz will be sentenced November 6th. He faces a sentence ranging from 20 years in prison of life imprisonment.
Lenz and Melanie had dated. He pleaded guilty to choking her to death with a belt in May of last year.