Catherine Willows and District Engineer Paul Newsome investigate the collapse of an old apartment building that resulted in three deaths. Catherine faces internal tension as she suspects Newsome of negligence in his safety inspections. Key Forensic Evidence

Nick Stokes identifies an unusual blood pattern on the instep of Kevin Shepherd’s shoe. Since Kevin was curled in a fetal position, the blood must have come from another source—someone who was "flowing" blood nearby.

This guide covers of the original CSI: Crime Scene Investigation (commonly referred to as CSI: Las Vegas ), titled "$35K O.B.O." This episode first aired on March 29, 2001 . Episode Synopsis