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    Gil Grissom

    Fictional character on American television series CSI: Crime Scene Investigation

    Not to be confused with Gus Grissom.

    Fictional character

    Gil Grissom
    First appearanceOctober 6,
    (CSI 1x01, "Pilot")
    Last appearanceDecember 8,
    (CSI: Vegas 1x10, "Signed, Sealed, Delivered")
    Portrayed byWilliam Petersen
    CityLas Vegas
    Costa Rica
    Paris
    Peru
    OccupationCrime Scene Investigator
    University Lecturer
    Wildlife Advocate
    Entomologist
    RankCSI Level III Supervisor
    Entomology Specialist
    Governmental Consultant
    Freelance Consultant
    Duration–, , , , ,
    Seasons1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13
    Other AppearancesImmortality
    Without a Trace (6)
    CSI: Vegas
    Born () August 17, (age&#;68)
    Santa Monica, California

    Gilbert Arthur Grissom (born August 17, [1]), Ph.D.

    is a fictional character portrayed by William Petersen on the CBS crime drama CSI: Crime Scene Investigation and its sequel, CS