Jenny Brandt is the main antagonist of 1999's Killerz, a Season 10 episode of Law & Order. She is a 10-year-old girl who murdered 7-year-old Aaron Polansky and roped her best friend Tara Madden into reluctantly trying to cover it up and frame an innocent man for the crime. She suggested making it look like sexual assault too. Despite her age, Jenny has a very cold, unrelenting and misogynistic demeanor and it's debated throughout as to whether or not she can receive treatment outside of a clinic and if not getting treatment from a clinic would prevent her from becoming a serial killer in the future.
She was portrayed by Hallee Hirsch.