The Thirteenth Floor.

In late 1990s Los Angeles, Hannon Fuller (Matt Peckham) owns a multi-billion-dollar computer enterprise, and is the inventor of a newly-completed virtual reality (VR) simulation of 1937 Los Angeles. When Fuller is murdered, just as he begins premature testing of the VR system, his friend and protégé, Douglas Hall (Craig Bierko), becomes the primary suspect, and begins to doubt his own innocence.

In 2000, The Thirteenth Floor was nominated for the Saturn Award for Best Science Fiction Film, but The Matrix won the award. Source:Wikipedia

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