problem to kill -KILL process

Fri Jan 20 21:24:26 UTC 2012

Hi

# ps ax|grep rad
45471  ??  T<Ls   263:35.44 /usr/local/sbin/radiusd
26473   1  S+       0:00.00 grep rad
flux# date
Fri Jan 20 23:20:28 UTC 2012
flux# kill -KILL 45471
flux# date
Fri Jan 20 23:20:41 UTC 2012
flux# kill -KILL 45471
flux# date
Fri Jan 20 23:20:54 UTC 2012
flux# kill -KILL 45471

top
    9 root        16    -     0K     8K syncer  2   7:12  0.00% syncer
45471 freeradius  20  -20   311M   283M STOP    0   3:38  0.00% {radiusd}
49114 root        21    0 10460K  4240K select  0   2:43  0.00% zebra

How to kill process without reboot?