Registered sex offender arrested again
A registered sex offender has been arrested again in Westchester County.
David Ohnmacht, 36, of Katonah, is accused of persuading a 14-year-old girl to send him sexually explicit videos of herself.
Federal authorities say he threatened to release it to her friends, if she did not send more.
Ohnmacht previously served nine years in prison on multiple sexual abuse and sexual assault charges involving children.