Lennie Briscoe: You sure he wasn't calling from Waco?
This refers to the Waco, Texas, siege of 1993. It was a 51-day standoff between government agents and members of David Koresh's doomsday cult, the Branch Davidians. The siege began after a gun battle that killed four government agents and six of Koresh's followers. On April 19, two days before this episode aired, the standoff ended when the Davidians' compound burned to the ground, killing 76 people, including Koresh.