Make sure that $pid is a numeric value only 
do
------------
echo" ==$pid == "
-----------------
and check where it is comming on the same line 
my system it was working fine . 


-----------o/p------------------
[EMAIL PROTECTED] docs]$ vim

[1]+  Stopped                 vim
[EMAIL PROTECTED] docs]$ ps -ad |grep vim
11777 pts/51   00:00:00 vim
[EMAIL PROTECTED] docs]$ export pid=11777
[EMAIL PROTECTED] docs]$ kill -9 $pid
[EMAIL PROTECTED] docs]$
[1]+  Killed                  vim
[EMAIL PROTECTED] docs]$

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