Walkin' on the Sun, by Smash Mouth

This song appears in Cold Case's episode 10 from season 1. The episode is called "The Hitchhiker".

Grooveshark: Smash Mouth – Walkin' On The Sun

Spotify: Smash Mouth – Walkin' On The Sun

About this song (from wikipedia):

"Walkin' on the Sun" is the debut single by American rock band Smash Mouth from the album Fush Yu Mang. Released in 1997, it was Smash Mouth's first major single, reaching #1 on Billboard's Modern Rock Tracks chart and #2 on the Billboard Hot 100 Airplay singles chart.

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