Plot summary
A married couple in the Witness Protection Program, Dennis and Camille Burnett are murdered in their home. Goren and Eames investigate and find that their surviving daughter Rachel ( Gaby Hoffmann ) is adopted and is separately seeing her birth father, Trevor Lipton ( John Shea ) and her birth mother, Maureen Curtis ( Melissa Leo ). After the detectives realize that Rachel will inherit the Burnett's wealth, and with the evidence they have uncovered, they deduce that Trevor and Maureen killed the Burnets and planned to kill Rachel after she inherited their estate which would then pass on the Trevor on her death.
Credits
Adapted from Wikipedia contributors, Law & Order: Criminal Intent season 4. HTML formatting and reference markers removed.