The police video footage of the last moments of 6-year-old Jeremy Mardis’s life shows deputy marshals firing a barrage of bullets at his father’s S.U.V. after a car chase on the dark streets of central Louisiana. It shows his father slumped over the open car window, injured and bleeding.

Minutes later, the words of an officer can be heard: “There’s a juvenile.”

The deputies had fired 18 times into the car, prosecutors say. The boy, strapped to the front passenger seat of the car, was struck five times in the head and chest. He was pronounced dead at the scene. In the aftermath, one of the officers appeared to vomit, according to audio from the footage.

The video was released on Wednesday at a preliminary hearing in a Louisiana court before the deputy marshals, Officer Norris Greenhouse Jr. and Lt. Derrick Stafford, were tried on charges of second-degree murder. It was the first public glimpse of what happened on Nov. 3 in Marksville, a small city near the Mississippi border.

It raised questions about basic police tactics and the wisdom of high-speed chases. But the fatal shooting of the child, who was white, received little of the national attention that has trailed other police killings. It spurred no organized street protests; no viral hashtags; no movement like Black Lives Matter, which was sparked by anger and despair over a wave of killings of African-Americans by law enforcement officials.