Video Showing Sacramento Police Executing Unarmed Black Man In ' Backyard of Grandparents

Stephon Clark, 22-year-old unarmed black man was shot and killed by Sacramento police Sunday night in the backyard of his grandparent's home.

The object that police saw in Clark's hand was a cellphone.

Questions that remain?

Were the reports about car windows being broken into accurate?

Why was Stephon gunned down instead of taken in for questioning by authorities?