cannot kill -9 a process

[Athanasios Douitsis]

Hello all,

I have run into a peculiar problem. A process in one of my servers
has stopped working, but when I kill -9 the pid the process won't go away.

ps axuw | grep nagios
nagios 36818  0.0  0.1  3964 2184  ??  TLs  30Mar05  46:14.69 /usr/local/bin/nagios -d /usr/local/etc/nagios/nagios.cfg

and

kill -9 36818 


Well, it won't die no matter how many times I'll try to kill -9 it. 

My uname is 

5.3-SECURITY FreeBSD 5.3-SECURITY #0: Sun Jan 16 09:53:48 UTC 2005     root at builder.daemonology.net:/usr/obj/usr/src/sys/SMP  i386

Does anyone have any constructive suggestion on how to get rid of it?

Thanks in advance
Athanasios