How to remove duplicate entry from SQL Table?

CaseProblem table has duplicate entry for CaseDetailId 

Id  CasedetailId

1    20152

2    20152 

3    20153

WITH CTE AS(
   SELECT CaseDetailId,
       RN = ROW_NUMBER()OVER(PARTITION BY CaseDetailId ORDER BY CaseDetailId)
   FROM dbo.CaseProblem
)

--select * FROM CTE WHERE  RN > 1   

 Delete  * FROM CTE WHERE  RN > 1

Final Result 

Id  CasedetailId
1    20152
3    20153
2    20152 this record should be delete.