ERROR: "TZ"/"tz" not supported

When I execute query, I've got error message.

test=> SELECT to_timestamp('00:00:05.601 SAMST Tue Jun 28 2005',
'HH24:MI:SS.MS TZ Dy Mon DD YYYY');
ERROR:  "TZ"/"tz" not supported

How can I convert '00:00:05.601 SAMST Tue Jun 28 2005'  (varchar type)
to timestamp with time zone?