The key thing about being a lich is that destruction never sticks - the lich's soul is locked away in his phylactery, and ensures that the lich always returns to plague the living:
Unless its phylactery is located and destroyed, a lich reappears 1d10 days after its apparent death.
But there don't seem to be any rules in the Monster Manual, nor Libris Mortis, that elaborate on this. Specifically, the location of the lich's reappearance. So a would-be band of lichslayers are left to wonder where they ought to lie in wait for their foe.
When a lich reappears after death, where does it reappear?
There are some tangentially related cases I know of: Dracoliches explicitly regenerate near their phylacteries, and Pathfinder sensibly plugs this rules hole. The webcomic Order of the Stick famously depicts a lich regrowing its body from scratch near its phylactery. But none of them directly address the issue.