Adrian Chase

Adrian Chase is the District Attorney of Star City.

Early life
Adrian met Oliver Queen in 2004 when Oliver tried to pick up his girlfriend.

Derek Sampson's case
Adrian was builing a case against Derek Sampson. Adrian was close to flipping Derek but some idiot in a hockey mask had "killed" Sampson.

After it was revealed that Derek Sampson was still alive, Adrian tried to contact Oliver to get the judge to sign a warrant. Shortly after, Adrian joked about their past and assured Oliver he doesn't hold grudges.

After the Green Arrow and his new team took care of Sampson, Adrian told Oliver that Sampson was apprehended.