How to kill a background ssh process?

I need to have a background ssh tunnel.

It is setup like this:
$ ssh -n -N -C -o "StrictHostKeyChecking no" -L 5433:localhost:5432
1.2.3.4 &

It needs to eventually be killed and restarted with another server IP.
What I'm doing is sending it a SIGTERM and it works but leaves a
defunct process. This is not too big a deal but I want it clean.

I have read from the man that a ~ followed by a . from stdin closes the
connection, but the manual also states that the -n option must be used
when ssh is to run in the background.

What is the best approach?

Regards, Clodoaldo PInto

.

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