Humanity becomes disease-free forever, but you have to kill the person you love most.

- No, it can't be yourself.
- All natural diseases stop existing, except for natural aging, though I suspect this will drastically increase humanity's average lifespan, but stuff like cancer, AIDS, etc., all disappear.
- You have to kill them by choking them to death with your own hands, while maintaining eye contact the whole time.

Can you do it?