Danny Heinrich, 53, led authorities this summer to the field where he buried Jacob's remains. As part of his plea bargain, prosecutors agreed not to charge Heinrich with murder.
"I am truly sorry for my evil acts," Heinrich said as he stood before U.S. District Judge John Tunheim, Jacob's parents, Patty and Jerry Wetterling, and the boy's siblings.
Heinrich told them that his actions were "heinous" and "unforgivable," and apologized for what he took away from them. He said he kept silent for nearly three decades because of his fear. But he offered no explanation for why he killed Jacob.
When he confessed in court in September, Heinrich quoted a handcuffed Jacob as saying, "What did I do wrong?"
Jacob's mother, Patty Wetterling said Heinrich deliberately set out to hurt a child the night he abducted Jacob on Oct. 22, 1989, while her boy was biking with his brother and a friend near their home in the central Minnesota community of St. Joseph. She pointed out that by Heinrich's own admission, he put two bullets into his gun and shot Jacob with them.
"You didn't need to hurt him. He did nothing wrong. He just wanted to go home," Patty Wetterling said.
Patty Wetterling also told her son's killer she won't "waste a minute of time" thinking about him "from this day forward."
The sentence was the maximum the law allowed, and Heinrich technically could complete it in 17 years with good behavior, but the plea deal allows state authorities to seek his civil commitment as a sexual predator at the end of his federal prison term, which could prevent him from ever going free. Tunheim said he "won't pretend" that the sentence is only about child pornography.
"What you've done is so heinous, so brutal and so awful that I don't believe society will let you go free," Tunheim said.
While some of Jacob's siblings said they want Heinrich to spend the rest of his life in prison, the family agreed with prosecutors and investigators that the plea deal was their best hope of learning Jacob's fate.
Early during the investigation, authorities questioned Heinrich, who maintained his innocence. But he came under renewed scrutiny when authorities decided to take a fresh look at the case around the 25th anniversary of the kidnapping.
As part of that effort, investigators used new technology to go back to a sex assault cause of a 12-year-old Cold Spring boy that happened nine months before Jacob's disappearance. They found Heinrich's DNA on that boy's sweatshirt, and used that evidence to get a search warrant for Heinrich's home in Annandale, where they found his child pornography collection last year.
After months of denials, Heinrich agreed in late August to confess to killing Jacob and the Cold Spring sex assault.
Heinrich detailed his crimes in chilling detail in court in September, recounting how he drove the boy to a gravel pit near Paynesville and molested him. After a patrol car with siren and lights passed nearby, he fired two shots at Jacob's head, killing him.
Patty Wetterling became a national advocate for missing children after Jacob's disappearance. A 1994 federal law named for Jacob requires states to establish sex offender registries.
The Jacob Wetterling Resource Center released this statement Monday regarding Heinrich's sentencing:
"We pause to reflect on the joy and kindness Jacob brought to his family and many others. That spirit continues through the thousands of adults and children who honor Jacob by committing to live by the traits set in the "11 for Jacob" movement.
Today's sentencing changes nothing for the Jacob Wetterling Resource Center's mission. There is much more work to do to address and prevent the abuse and exploitation of children. Today, our request is simple: Be fair. Be Kind. Be understanding. Be honest. Be thankful. Be a good sport. Be a good friend. Be joyful. Be generous. Be gentle with others. Be positive. We can all continue Jacob's Hope."
WLS-TV contributed to this report.