J.J. Jarrett is a minor character from Friday the 13th Part VIII: Jason Takes Manhattan. She is a hair metal rocker, skilled guitarist and best friend of Wayne Webber. She was portrayed by Saffron Henderson.
J.J. attended Lakeview High School, located near Camp Crystal Lake. She and her fellow graduating class boarded the S.S. Lazarus, looking to take a vacation to New York. Unknown to those on the ship, Jason Voorhees had snuck onto the ship and decided to kill each person on the ship one by one. J.J. was friends with her classmate Wayne Webber whom she warned about his infatuation with the selfish and manipulative Tamara Mason. J.J. was doing a jam session with her electric guitar in the machine room after telling Wayne that he's "an asshole!". She then spotted Jason and tried to escape, but he appeared right in front of her and smashed her skull with her own guitar, killing her.