What was the name of that law and order episode that was like a continuince of law and order svu?

There was this one episode on svu and it was like a mother daughter team the daughter raped famous guys and then gave away the dna, and then on law and order the mother and the daughter killed some guy and the last phone number dialed on his phone was detective benson and the she like guest starred in the law and order episode to find out who killed that man. what was the name of the episode and what ;aw and order season/year was it in?

The first part, the svu episode, is called Design (season 7) and it is continued with the L&O episode called Flaw, which is in season 16.