Hubris

S11, E9: Three adults and a young child are found brutally murdered in the backroom of a jewelry store. The victims are the owners, Adam and Corinne Bennett, as well as jewelry designer Gail Churchill and her daughter Ellie. When detectives Briscoe (Jerry Orbach) and Green (Jesse L. Martin) question Gail's ex-husband David (Jim Budig), his alibi checks out and they move on to her current boyfriend Mark Landry (Tim Guinee) who is not the man he claims to be...