The devasted stepdad of the 11-year-old boy shot dead in a road-rage attack screamed “my kid is dead” to cops and collapsed onto a Nevada freeway — as the alleged gunman calmly copped to the killing and surrendered, newly released police bodycam footage shows.

The chilling video, released by the Las Vegas Metropolitan Police Department , shows the boy’s stepfather, Valente Ayala, wailing in anguish at a stunned officer that his stepson, Brandon Dominguez, lay dead in the backseat of his car after a heated clash on a Las Vegas-area freeway on Nov. 15.

“My kid is dead,” the grief-stricken man howled as he pointed toward his Chevy SUV. “My son!”

Ayala was driving the young boy to school at 7:30 a.m. when he and 22-year-old Tyler Matthew Johns began aggressively jockeying for a lane on

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