Cannot drop column

I'm not seeing why postgres won't drop a table's column:

bustrac=# select * from statustypes order by stat_name;
      stat_name 
--------------------
  Client
  Lead
  No further contact
  Opportunity
  Proposal submitted
  Prospect
  Qualified
  Referral
  Suspect
(9 rows)

bustrac=# alter table statustypes drop column Suspect;
ERROR:  column "suspect" of relation "statustypes" does not exist
bustrac=#

What have I done incorrectly?

TIA,

Rich