How do I stop RADIUS running in debug mode (radiusd -X)?

[agalnx77]

I have tried 'radiusd stop' but the process remains up and running.

agalnx-srv-01:~ # ps -a
  PID TTY          TIME CMD
22599 pts/1    00:00:00 su
22603 pts/1    00:00:00 bash
22812 pts/2    00:00:00 su
22814 pts/2    00:00:00 bash
23218 pts/2    00:00:00 radiusd
23400 pts/3    00:00:00 su
23402 pts/3    00:00:00 bash
23661 pts/3    00:00:00 ps
agalnx-srv-01:~ # radiusd stop
agalnx-srv-01:~ # ps -a
  PID TTY          TIME CMD
22599 pts/1    00:00:00 su
22603 pts/1    00:00:00 bash
22812 pts/2    00:00:00 su
22814 pts/2    00:00:00 bash
23218 pts/2    00:00:00 radiusd
23400 pts/3    00:00:00 su
23402 pts/3    00:00:00 bash
23670 pts/3    00:00:00 ps
agalnx-srv-01:~ # 
agalnx-srv-01:/etc/raddb # radiusd -v
radiusd: FreeRADIUS Version 2.1.6, for host i686-pc-linux-gnu, built on Oct
27 2009 at 17:05:49
Copyright (C) 1999-2009 The FreeRADIUS server project and contributors.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
You may redistribute copies of FreeRADIUS under the terms of the
GNU General Public License.
For more information about these matters, see the file named COPYRIGHT.
agalnx-srv-01:/etc/raddb #

Thank you, 
--ag