Karen is a straightforward agent of the Drug Enforcement Administration who means getting business taken care of. She takes her job as a DEA agent serious enough. She also seems to have a thing for Riggs from the day they met, as they seem to be spending time together.
In the episode Fashion Police, Palmer leads a drug investigation that is linked to the murder of one of L.A.'s fashion expediters, which Riggs and Murtaugh are examining, and that was when Palmer and Riggs met. There, they follow a trail of evidence that leads them to an ongoing and exceptionally dangerous underground investigation led by the DEA.
To view the Karen Palmer gallery, click here.