Server Administration :: How To Kill Killed Session

How to kill of a killed session?

I had killed inactive session using alter system kill session 'sid,serial#';

after that that sessions marked as killed and still get in v$session.

Then i try to get spid so that i can killed then from os command kill -9 spid

but when i try to get that join with v$process, no row select.

select * from v$session where username ='CAS' and status ='KILLED'

return 205 records.

select p.*,s.username,s.program,s.machine,s.status from v$process p,v$session s
where p.addr=s.paddr and s.status='KILLED'

return no record.