David J. Renz is suspected of killing a librarian and kidnapping her 10-year - old daughter . A man accused of killing a school district librarian and raping her 10-year-old daughter in upstate New York had removed an electronic tracking anklet before carrying out the attack , police said . He abducted the pair as they left a gymnastics camp in upstate New York , police say . Authorities say he managed to take off an electronic tracking device before the attack . Probation Officer was not charged because he removed the anklet so fast , officer says .
David J. Renz is suspected of killing a librarian and kidnapping her 10-year - old daughter . He abducted the pair as they left a gymnastics camp in upstate New York , police say . Authorities say he managed to take off an electronic tracking device before the attack . Probation Officer was not charged because he removed the anklet so fast , officer says .