[jQuery] Do events remain is memory when element is removed from DOM?

Is it necessary to unbind events from elements before removing them.
As like the following:
$("#list").find("li").unbind("hover").remove();
$("#list").html(<<List of New LI's>>);
I'm building a plugin, and I want to know if the events listners will
remain in memory, as code similar to the above will run every 5
seconds or so.