LOS ANGELES — An illegal immigrant with a history of drunk driving is now behind bars for allegedly causing a fiery, head-on crash while inebriated in San Diego that killed an 8-year-old girl and injured several others, The Post has learned.

Brayan Alva-Rodriguez, 25, who is from Guatemala, was allegedly drunk behind the wheel of his Toyota Tacoma when he crossed the double-yellow line on San Felipe Road near Ranchita on Sunday — smashing straight into a Toyota Camry, the San Diego Union-Tribune first reported .

Alva-Rodriguez’s Tacoma then smashed into a Ford F-350 with a utility trailer that had been ahead of him in the other lane, causing the migrant’s truck to flip and erupt into flames, the outlet also noted, citing California Highway Patrol.

Only Alva-Rodriguez and his passenge

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