Gleaming the Cube (1989)

"All he cared about was gleaming the cube...until the night they killed his brother."

An Orange County teenager's carefree life of ditching class and skateboarding abandoned pools comes to a screeching halt when someone close to him dies. The cops rule the death a suicide, but the bereaved skater believes he was murdered. It's up to him to solve the case, with a skateboard.