Eric was a tow truck driver at the time and was on a quest to find sunglasses for Caine.
As he knew the area quite well, he helped Caine recover the murder weapon which Caine used to prevent an innocent man from going to jail.
It has been recently revealed that Eric was born in Cuba before his mother and adoptive father arrived in the USA before receiving fake birth documents for him.
Delko pressed his mother for the truth after he revealed that he knew his American birth certificate was a forgery, and had acquired his real birth certificate from Cuba.
He is a Level 3 CSI, specializing in fingerprint and drug identification.