BARABOO, Wis. -- A Sauk County judge sentenced Eric Hainstock to life in prison with the possibility for a parole in 30 years on Friday for the killing of his high school principal.

VIDEO: Watch The Report | VIDEO: Shawn Hainstock Speaks After Son's Sentencing (Unedited Version) | VIDEO: Susan Klang Speaks At Hainstock's Sentencing (Unedited Version) | READ: Read Eric Hainstock Trial Blog

The 16-year-old boy was convicted of fatally shooting Weston Schools Principal John Klang last September. A jury convicted him of first-degree intentional homicide on Thursday night.

Judge Patrick Taggart handed down the sentence after hearing from Klang's friends and family. In emotional testimony, friends and family described how Hainstock's actions have forever changed them.

Klang's widow, Sue, testified on Friday that the loss of her husband leaves her with emptiness and despair.

"Words seem trite in describing what follows when your husband is murdered and your children's father is stripped from your life," Sue Klang said. "John was the love of my life. My best friend, the father of our three children. We were high school sweethearts at 16. We had been through thick and thin together for 33 years, married for 26."

Daughters of John Klang shared their pain over his death Friday.

"I had gotten engaged four days before my dad passed away, and my new fiancé and I were planning to come down and tell my parents in person over the weekend. We waited all week. We were so excited, and I ended up telling my mom some of the happiest news of my life in the waiting room at the hospital while my dad was dying," said Kerri Klang, daughter of John Klang.

"I don't know what to say except I miss him and I will never forgive you for what you did to my family," Kerri Klang added.

"Because of one person's selfish and senseless act, I lost my father, my friend, my role model," said Kristi Klang, daughter of John Klang.

Sue Klang said she has seen no remorse from Hainstock for what he did.

"The only one I have not seen shed a tear is Eric himself. I have yet to see any sign of remorse," she said. "Less than two hours after he shot John, he told detectives he was hungry, so they gave him something to eat. He then sat there and ate a sandwich with my husband's blood literally still on his hands."

"We are scarred at Weston forever. Those scars will take years to fade and they will never be completely gone," said Melissa Nigh, principal at Weston High School.

Defense attorneys argued on Friday that because of Eric's age and abuse history, he should be first eligible for parole after 20 years.

The state argued for 49 years with the date of eligibility being Sept. 29, 2056 -- or 50 years after the shooting at Weston Schools, WISC-TV reported.

Defense attorney Rhoda Ricciardi was the only person to speak on Hainstock's behalf at Friday's sentencing hearing.

"Judge, there does need to be a message, that you can't do this. You can't bring loaded weapons in, you certainly can't discharge them when you get in there," Ricciardi said. "The jury sent that message. They sent it last night."

The judge said that he considered Hainstock's age and background before sentencing. He said that he believes the teen can be rehabilitated.

Hainstock did not speak at his sentencing, nor did his family, WISC-TV reported.

But afterward, Eric Hainstock's father Shawn said that his son was different than the emotionless person seen in the courtroom.

"He's not heartless. People don't know him like we do. He's a loving boy. Everybody tries to paint a picture that he's evil and he's not," Shawn Hainstock said.

Shawn Hainstock said that he didn't know he could speak at sentencing on Friday. He said he would have told the judge he was sorry about what happened.

"Our deepest sympathies and sorrows go out to the Klang family and all their friends and family and everybody that's been hurt by this," Shawn Hainstock said. "Everybody has got to realize that we love our son and we have to stand by his side, too."

The judge urged the state Department of Corrections to place Hainstock in a juvenile detention center. But, Taggart said that he had no control over where Hainstock would be placed.

The jurors who convicted Hainstock said that they focused on the guns and ammunition that he brought to school and the number of shots fired in determining his intent to murder.

Juror Brian Ludolph, of Prairie du Sac, said on Friday the fact numerous shots were fired by Hainstock convinced them the student intended to kill Klang. Ludolph said that Hainstock bringing the guns and ammunition to school also played into their finding of intent.

Juror Diana Mielke, of North Freedom, said that the jury was initially split on whether Hainstock intended to kill Klang.

Mielke said that she was initially among the six who thought Hainstock didn't have intent to kill, but changed her mind after recalling Hainstock's lack of emotion during the trial.

Juror Sharyl Coy, of Reedsburg, said that the fact Hainstock kept shooting showed his intent to kill. She also called the experience "mind draining."