It's the end of an era on CSI. The Las Vegas Crime Lab is losing the head man. Gil Grissom is packing up his office and leaving Las Vegas. The night shift supervisor, the most influential scientist on the staff, Dr. Gilbert "Gil" Grissom will be a character that won't easily be forgotten, let alone replaced.

If Laurence Fishburne is wise, he'll work with the producers and writers to make Raymond Langston a very different kind of leader.

Looking back at the Grissom years, there are distinctive beats that William Petersen brought to the character and the show. To me, there are six reasons why Grissom will be hard to replace.

While Elizabeth Berkley's TV pedigree was perhaps better received than her feature film debut, it was the notorious Showgirls that made her a household name and launched her into the "Worst Films Ever" hall of fame. Her career began in the teen series Saved by the Bell, which also netted us Dancing with the Star's Mario Lopez, NYPD Blue's Mark Paul Gosselar and Beverly Hills, 90210's Tiffani-Amber Thiessen.

After Showgirls, it took the actress many years to regain credibility and acclaim, working in theater and off-Broadway productions until her return to television in 2002 in a recurring role on Titus. Since then she has guested on several shows, including CSI: Crime Scene Investigation. Now, Reuters tells us the 35 year-old Berkley is set to play Horatio Cane's (David Caruso) ex-wife Julia Winston and mother to his recently discovered teenage son (Evan Ellingson) on spin-off CSI: Miami. Miami is known as a "hotter, sexier" CSI, so she should fit right in. She can even try to match Caruso's one-of-a-kind line delivery when they inevitably spar.