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SQL Server: kill statement

The kill statement can be used to terminate a process: 
kill session_id
kill UOW
kill session_id with statusonly
kill UOW        with statusonly
The session id can be found in the column spid of the view sys.sysprocesses.

kill SPID with statusonly

Sometimes, killing a session takes longer than expected, typically because the instance needs to roll back a session's transactions.
In this case, kill N with statusonly can be used to get an estimation on how far the rolling back has proceeded: 
kill 61 with statusonly
 
SPID 61: transaction rollback in progress. Estimated rollback completion: 37%. Estimated time remaining: 195 seconds.

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