A man already convicted as a sex offender was sentenced to two mandatory life terms Wednesday for repeatedly abusing a young boy and videotaping his actions.

The victim in the current case did not testify in federal court in Central Islip at the sentencing of Jay Kroll of Massapequa.

But another man, who had been abused by Kroll as a pre-teen in the 1990s, did. In that case, Kroll served six years in state prison, according to officials.

That previous victim said before Kroll’s sentencing: “My life changed. I couldn’t understand what happened to me. My childhood was taken away from me. After that I never felt the same . . . because of the abuse, I turned to drugs.”

Before he was sentenced in the current case, Kroll told U.S. District Judge Leonard Wexler: “I know it might not matter, but I would like to apologize.”

Eastern District prosecutor Artie McConnell called for the life sentences, saying in all his years of prosecuting such cases he had never seen such violent sexual abuse. To the victim, the crime “will last a lifetime,” McConnell said.

Wexler said that while he had no choice under the law in imposing the life sentences, he was usually not inclined to impose such sentences.

“But this is exceptional,” Wexler said.

Kroll’s attorney, Stuart Grossman, said he did not think it was fair to give “a life sentence for someone who . . . didn’t kill anybody. . . . It’s not a just sentence.”

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Grossman said he was representing a gang member who was accused of two murders and an attempted murder and was offered a plea of several dozen years.