How Do You Find A Primary Key Violation

I need to find out which record I am violating by trying to execute this stored procedure

ALTER PROCEDURE InsertCorovan2004
AS
INSERT INTO [GamingCommissiondb].[dbo].[Corovan_Table]
([TM #],
[FirstName],
[LastName],
[SS #],
[TerminationDate],
[Voluntary or Involuntary])

SELECT [TM #], FirstName, LastName, SocialSecurityNumber, TerminationDate, VoluntaryorInvoluntary
FROM dbo.TERMINATION
WHERE (TerminationDate BETWEEN CONVERT(DATETIME, '2004-01-31 00:00:00', 102) AND CONVERT(DATETIME, '2004-12-31 00:00:00', 102))

GO



when I execute it I get this error message
Server: Msg 2627, Level 14, State 1, Procedure InsertCorovan2004, Line 3
Violation of PRIMARY KEY constraint 'PK_Corovan_Table'. Cannot insert duplicate key in object 'Corovan_Table'.
The statement has been terminated.
Stored Procedure: GamingCommissiondb.dbo.InsertCorovan2004
Return Code = -4


I am trying to insert 2004 terms into the corovan table from TERMINATION table. How do you find out what records match from each table (compare the tables reocords for dups). How would I do this in the query analyzer since thats mainly what I use. I get a better understanding of how to create proceudure in the query analyzer so I;d rather stick to it.

In short I need to find the Culprit record that is preventing me from insert the 2004 records


Thank you