J.D. Lambert

 is a character in The Sinner.

Story
JD is a drug dealer who drives a black 83 truck with a white top. He dated Cora until 4th of July weekend. He made Cora have sex with another man for a drug deal. Upon Phoebe's death, he organized a way to hide her body. He then blackmails the Belmont's.

Ambrose brings him in for questioning and acts like he doesn't know the Tannettis. He is confronted by Mason Tannetti, and they get in a physical altercation

Eventually he is murdered despite the fact that he is the only lead at the time.