Session that has been killed hangs around

Hi,
This is probably an old issue and many may have figured out but I haven't and need your help. We have noticed that when the application sessions get hung in the Oracle server (we are running Oracle 9.0.1 on AIX 4.3.3), we kill them with ALTER SYSTEM command. The session status shows it has been KILLED but it does not vanish. Then we look for associated PID and do "ps -ef" but the process is no longer there. How we get rid of sessions that are hung and subsequently KILLED but have not gone away ? The only we have figured out to clean them up is by restarting the instance. We can't afford to restart the instance in production to handle this. Can someone let me know how to handle this ?
Thanks in advance.

the killed sessions will show in v$session until PMON clears them up (yes, during startup).
the unix process is dead, and the killed session is not taking ANY resource. it shows KILLED in v$session just like INACTIVE sessions do. why do you mind them?
from Note:100859.1:
PMON will not delete the session object itself until the client connected to
that session notices that it has been killed. Therefore, the sequence of
events is:
1) alter system kill session is issued - the STATUS of the session object in
V$SESSION becomes KILLED, its server becomes PSEUDO.
2) PMON cleans up the resources allocated to the session
(i.e., rolls back its transaction, releases its locks, etc).
3) the entry in V$SESSION remains there until the client of that session (the
client is the process associated with the OSUSER,MACHINE,PROCESS columns in
the V$SESSION view) tries to do another request.
4) the client attempts another SQL statement and gets back ORA-28.
5) PMON can now remove the entry from V$SESSION.
This behavior is necessary because the client still has pointers to the
session object even though the session has been killed. Therefore, the
object cannot be deleted until the client is no longer pointing at it.
hope this helps, Nogah.

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