Law & Order: Special Victims Unit: 1x15

Entitled (I)

After a salesman is murdered, the detectives turn their attention to Stephanie Mulroney, the youngest daughter of a well-known family with some deep connections. But as they join forces with the officers from the two-seven, they realise that their case is connected with a long-unsolved case that Briscoe once handled years ago with his former partner, Mike Logan.

The crossover continues on Law & Order S10E14 Entitled (II).