Antoine Jesper is Lead Criminalist with the Los Angeles Police Department's Scientific Investigations Division. He is relatively young and of African-American ancestry.
In January of 2002, he worked on the Arthur Delacroix murder. In particular, he identified a skateboard found in Nicholas Trent's home as a Boney Board. Later he found initials scratched into the surface of a skateboard, indicating that it had belonged to Delacroix. He provided information to Harry Bosch on the manufacturer of the skateboard and when it was produced.