OSAGE — A placement hearing is scheduled May 6 for a teenager convicted of killing his mother at their Osage home more than four years ago. Prosecutors say Noah Crooks was 13 years old when he fired rifle round after rifle round into his mother, 37-year-old Gretchen Crooks, in their Osage home on March 24, 2012. He was convicted of second-degree murder as a youthful offender in 2013.