Alter system inside a Stored procedure

We have a stored proc (owned by a dba id) that accepts the sid and serial# and executes an "alter system.." to kill the session based on the passed values. We granted execute on this proc to a monitor account that monitors for any blocking sessions and wants to kill the offending ones. Trying to run this proc from that monitor account (which has execute on the proc) returns the following error --
ERROR at line 1:
ORA-01031: insufficient privileges
ORA-06512: at "ORACLE.KILLSESSION", line 43
ORA-06512: at line 4
The line returning the error is this --
execute immediate 'alter system kill session '''||c_sid||','||c_srl||'''';
Any ideas why the alter system doesn't work although the monitor account has execute on this proc?
We've successfully used this technique to trucate tables (which needs the powerful "drop any table" priv and it has worked fine there).
Thanks!

Thanks for reply Kamal.
The owner of the proc (called "ORACLE") had the DBA role granted to it. After doing a "set role none", I tried the alter system from that id and it didn't work. I then granted the ALTER SYSTEM priv directly to the owner and this worked!
The lingerning question though is why does the same priv not work via the dba role.
SQL > select * from dba_sys_privs where grantee='DBA' and privilege like 'ALTER SYSTEM%';
GRANTEE PRIVILEGE ADM
DBA ALTER SYSTEM YES

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