Karen Palmer is a straightforward agent of the Drug Enforcement Administration who means business and gets business taken care of. She takes her job as a DEA agent serious enough the same as any agent would.
She also seems to have a thing for Riggs from the day they met, as they seem to be and have been spending time together.
Palmer is leading 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.
Palmer and Riggs and Murtaugh are all assigned together in protecting a federal witness, Leo Getz, an attorney who witnessed DEA agent Daniel Zigman and Flaco Ruiz's murder by the Flores drug cartel at a donut shop which Riggs and Murtaugh were investigating.
It was mentioned that she slept with Riggs.
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