Clark steps toward the officers. Behind the wall, one of the officers issues another command. “Show me your hands!” And then: “Gun, gun, gun!”

Both officers open fire. Sparks from the bullets light up the helicopter’s infrared camera in sharp white pops.

The sequence, from the first glimpse of Clark on the patio to the first gunshot, unfolds in about six seconds.

The officers are never heard identifying themselves as police before fatally shooting Clark.

“He was at the wrong place at the wrong time in his own back yard?” his grandmother, Sequita Thompson, told the Sacramento Bee. “C’mon now, they didn’t have to do that.”