Parmertor's mother, Dina, last year told CNN's Anderson Cooper her son was a jokester "everyone wanted to be around." Daniel had just started a job at a local bowling alley.

"My heart is broken. It is torn apart. .. I want people to know him," said Dina Parmertor. "They did not know the joy of knowing him."

Tuesday, she looked at Lane and called him a "weak, pathetic vile coward."

"If I had my choice you would die an extremely slow, torturous death," the mother said.

Before he sentenced Lane to consecutive sentences of life without parole and additional sentences totaling 37 years, Fuhry said the former student showed no remorse, feigned mental illness and seemed determined to make "front-page news."

"A school is a place where a student should feel safe," the judge said, adding Lane took advantage of unsuspecting students. "These juveniles were ambushed."

Fuhry said Lane would be a danger if he were ever released.

King's sister, Crystal, called Lane a "monster." Her brother was a compassionate blood donor who tried to become a friend of Lane because "he felt sorry for him."

After the sentencing, defense attorney Friedman said Lane's comment to the families was a "very difficult statement to hear."

Lane's sister, Sadie Lane, pleaded for compassion and prayers for her family a well as for those of the victims. She, too, was in the school cafeteria when the rampage began.

"Many families were damaged that day. Our family was, too," she said.

While the judge indicated Tuesday there was no known motive for the attacks, Flaiz said his office has a theory it would have presented if the case had gone to trial. He declined to elaborate, saying he will meet with victims' family members in the next week.

"I got a sense from the families they wanted to hear why he did it and they wanted to hear remorse," Flaiz said.

Residents have come together since the shootings, the prosecutor said. "Sometimes it takes a tragedy for everyone to realize how close-knit a community we have."

"In the end, everyone is sad. It is an incredibly sad situation."