I believe Faceman already got it, but let me spell things out a little more:
1st Level below Temple District: Temple District Sewers. Exits include passages to the NE and SE (which take you back up to ground level), two secret doorways to the north (one of which requires a certain key, and one which can be opened just by pushing), and a passage to the NW. This northwest passage will be closed to you until you have accepted a certain quest.
Following this northwest passge takes you to the 2nd Level below Temple District. In this level you will find a locked door, and also someone who holds the key to that locked door. Behind the door is your Lich.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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