Dwight Kasdan was a serial killer in Virginia who targeted people connected to a call-girl named Charlotte Cook who also happened to Kasdan's girlfriend.
At some unknown point he met a call-girl named Charlotte Cook and represented her and got cases against her kicked. After an unknown point in time they started dating but the relationship was not a happy one as Kasdan was often abusive towards her and even tried to get her out of seeing other people but she refused. Dwight became enraged and started to kill her customers to make her stop. He would use a big knife to stab them in the back and leave them for dead.
He eventually found out that a naval officer was writing a story about the murders and killed him to silence him. After Charlotte was brought in for questioning he tried to get it kicked but they detained her as a material witness to the murders when she was proven innocent.
His next victim was given to NCIS and he directed his rage toward the woman who had brought Charlotte into the business in the first place: Holly Snow. After he beat Charlotte for her phone, he called Holly under the guise of being Charlotte and lured her into a trap.
After binding her and saying he blamed her for getting Charlotte into the business he tried to kill her but was instead killed by Agent Gibbs.