Kumaritashvili killed during 1992 Games practice run in Kumaritashvili . Preliminary inquiry says human error caused accident . Other athletes expressed concerned about the speed of the luge track . Nodar Kumaritashvili 's death was the first since Olympics .
Nodar Kumaritashvili killed during Olympics practice run in Vancouver . Preliminary inquiry says human error caused accident . Other athletes expressed concerned about the speed of the luge track . Kumaritashvili 's death was the first since 1992 Games .