Jimmy was the first floor guard who worked in the main lobby of the Visitor Center at Jurassic Park.
At one point, he spotted Dennis Nedry going into the garage. He is later found dead by Alan, Tim, and Lex near his metal desk. It can be assumed that he was killed by the eight Velociraptors that escaped their holding pen when the main power failed. His partner, the unnamed second floor guard stationed near the lab, also suffers this same fate.