A jury on Tuesday sentenced a Houston man convicted of killing a 6-year-old boy and a homeless Vietnam veteran during four car crashes to 80 years in prison, authorities said.

Blaine Boudreaux, 38, was sentenced after about four hours of deliberation by a jury that convicted him of felony murder in the deaths of Joshua Medrano, 6, and Leonard Batiste, 61, during a string of daytime crashes on April 26, 2015.

“He should spend every day of it behind bars thinking about the people he killed,” Harris County District Attorney Kim Ogg said in a statement obtained by The Post. “Hit-and-run murder is an especially cowardly crime.”

Authorities said Boudreaux, who had five prior arrests for driving while intoxicated, crashed his pickup truck four times in the span of two hours, killing Joshua and Batiste, who was pushing a shopping cart while looking for scrap metal along Texas Spur 5 when Boudreaux ran him over.

Minutes later, Boudreaux killed Joshua when he collided with a Honda Civic driven by his mother, who was headed back to their Pasadena home after celebrating his grandmother’s birthday, authorities said.

“This little boy deserves justice,” Harris County District Attorney’s Office’s vehicular crimes chief Sean Teare said. “He never got to grow up. Angel and Cynthia never got to see him have a girlfriend or go to prom or have children — it got taken away from him, just snatched away.”

Boudreaux also rear-ended two other cars prior to the fatal wrecks, including one that netted him a traffic ticket, the Houston Chronicle reports.

Boudreaux, meanwhile, testified in his own defense earlier Tuesday, saying he was the son of alcoholics who endured a dysfunctional childhood in Louisiana, KPRC reports. But he was determined to be a good father to his son, who was born with significant health issues, he testified.

Boudreaux told prosecutors and his attorneys during questioning that he couldn’t remember the four accidents, saying he blacked out while high on Xanax and awoke to screams and an officer telling him he had just killed a young boy, according to the station.

An attorney for Boudreaux, who was also addicted to opioids, had asked jurors to spare his client the maximum sentence, saying the killings weren’t “cold-blooded murder.”

“You can send a message without putting Blaine in prison for the rest of his life,” attorney Billy Skinner told jurors. “And I believe that Blaine is the type of person that could be rehabilitated.”

Boudreaux faced up to 99 years or life in prison. In addition to his 80-year sentence, he was fined $5,000, Ogg said.

Assistant District Attorney Lynn Nguyen characterized Boudreaux as a prosecutor’s “worst nightmare” and urged jurors to make sure he could never wreak havoc on Harris County roads again.

“How many more people are we going to let him hurt before we say that enough is enough?” Nguyen asked jurors.