[Rannath]

Be respectful, even after they're gone, your employees should know that even if you let them go you'll treat them with some level of respect. Your team might already knows this person is under-performing.

It's a sad thing to fire someone, or be fired. Let it be a sad thing, but do what's necessary.

If you give them a reasonable chance to improve, you should feel free to let them go. I'd probably give someone a month to improve, or find another job. Resources allowing.