(CNN) Reat Griffin Underwood was heading to a high school singing competition when a gunman shot him dead. 
 
 On Tuesday, his voice rang out again. This time, it echoed in a crowded courtroom as a judge weighed whether the man who gunned down the 14-year-old, his grandfather and another victim at two Kansas Jewish centers last year should pay for the killings with his life. 
 
 As relatives of the shooting victims made their case for why Frazier Glenn Cross should receive the harshest sentence the law allows, Underwood's mother, Mindy Corporon, held her cell phone near the microphone and played a video of her son singing the national anthem. With their hands over their hearts, many in the courtroom stood. Some sang along. 
 
 Soon afterward, Judge Thomas Kelly Ryan read his order, affirming the jury's verdict and sentencing Cross to death by lethal injection. 
 
 Cross, who represented himself during the trial and was found guilty in August , has a history of espousing anti-Semitic and white supremacist views and was thought to be targeting Jews when he launched the April 2014 attack. In September, jurors said he should get the death penalty for the killings. 
 
 Tuesday was an emotional day in court, with the prosecutor tearing up as he said the killings were the most egregious crimes the county had ever seen, CNN affiliate KSHB reported 
 
 "This is the most disruptive, evil human being I've encountered in my career," Johnson County District Attorney Steve Howe told reporters after Tuesday's hearing, according to KSHB. 
 
 "This is the most disruptive, evil human being I've encountered in my career" Steve Howe, Johnson County DA pic.twitter.com/3NvwCRnAX8 — Shannon Halligan (@ShanHalligan) November 11, 2015 
 
 The shooting rampage started when Cross killed William Lewis Corporon, 69, and his 14-year-old grandson, Reat Griffin Underwood, at a Jewish community center in a Kansas City suburb. Cross then murdered Terri LaManno, 53, at the nearby Village Shalom Retirement Community. 
 
 Lukas Losen, Underwood's brother and William Corporon's grandson, was among the family members who spoke out in court on Tuesday. The seventh-grader said he lost his childhood in a split second the day of the shooting. 
 
 "Now I've watched my grandma ... try to exist with a broken heart and live in the house alone. Some of my earliest memories after the tragedy include waking to the sound of my mother sobbing each morning, feeling a sense of denial and depression and desperately wanting my old life back," he said. 
 
 After the judge read his sentence Tuesday, Cross shouted out "Heil Hitler" multiple times in court. 
 
 "One day my spirit will rise from my grave and you all will know that I was right," he said. 
 
 Despite his apparent intentions, none of the three people Cross killed were Jewish. 
 
 JUST WATCHED 2014: Accused Kansas shooter has racist past Replay More Videos ... MUST WATCH 2014: Accused Kansas shooter has racist past 02:37 
 
 He later pleaded not guilty but admitted to the killings, claiming he "wanted to kill Jews, not people," according to CNN affiliate KCTV. 
 
 In court on Tuesday, Cross argued with the judge, KCTV reported , saying he had been demonized by the media and didn't get a fair trial. 
 
 "I can't get a fair trial because of you. This court, it is because you're under rule of the Jews, and you support yourself accordingly," Cross said. 
 
 His request for a new trial was denied, CNN affiliates reported. ||||| Frazier Glenn Cross, also known as Glenn Miller, sits during his capital murder trial in Johnson County Courthouse in Olathe, Kansas, August 31, 2015. 
 
 Frazier Glenn Cross, 74, a former senior member of the Ku Klux Klan, talks to the Johnson County District Judge Kelly Ryan (not pictured) during his sentencing hearing in Johnson County District Court in Olathe, Kansas October 10, 2015. 
 
 OLATHE, Kan. A judge on Tuesday issued the death penalty for the white supremacist convicted of shooting to death three people at two Jewish centers in Kansas last year. 
 
 Johnson County District Court Judge Thomas Kelly Ryan sentenced Frazier Glenn Cross, 74, to die by lethal injection. 
 
 A jury in early September convicted Cross, a former senior member of the Ku Klux Klan, of the murders and recommended that he be put to death. Cross also was convicted of three counts of attempted murder for shooting at three other people. 
 
 The jury found Cross guilty of killing Reat Underwood, 14, and his grandfather, William Corporon, 69, outside the Jewish Community Center of Greater Kansas City, and Terri LaManno, 53, outside a Jewish retirement home, both in Overland Park, Kansas. 
 
 After the judge announced his decision, Cross gave the "Heil Hitler" salute and was forcibly removed from the courtroom. 
 
 On the way out, Cross said, "One day my spirit will rise from the grave and you'll know I was right. I'm a happy man." 
 
 Cross said in court on Tuesday, as he did during the trial, that he wanted to kill Jews because he believes they control the media, financial institutions and the government. 
 
 "Jews are destroying the white race," he said, calling himself a patriot. None of those he killed were Jewish. 
 
 In court statements before the sentencing, several relatives of victims denounced Cross for his views and spoke of their painful losses. Cross, a military veteran, sat at a court table in a wheel chair, sometimes glancing up at those who spoke at the podium. 
 
 Will Corporon, son of William Corporon, glared at Cross as he talked. 
 
 "You are a coward," he said. "You are not a patriot. You are a disgrace to the uniform you wore." 
 
 Cross, representing himself in court, said on Tuesday he should be released because he was justified in trying to kill Jews. 
 
 "I wanted to kill Jews, not Christians and I do regret it," Cross said. During the trial he faulted the victims for associating with Jews by going to Jewish centers. 
 
 Melinda Corporon, wife of William Corporon, told Cross he has never known love. 
 
 “We are here today to make sure this voice of evil is silenced permanently,” she said. 
 
 Kansas restored the death penalty in 1994; no one has been executed in the state since 1965. 
 
 (Reporting by Kevin Murphy in Kansas City; Editing by Mary Wisniewski, Alan Crosby and Leslie Adler)
– Frazier Glenn Cross, the white supremacist whose poisonous beliefs led him to murder three people at two Jewish sites in Kansas last year, was unrepentant after he was sentenced to death on Tuesday. The 73-year-old, who also goes by the name Frazier Glenn Miller, shouted "Heil Hitler!" after the judge affirmed a jury's decision and issued the death sentence, CNN reports. "One day my spirit will rise from the grave and you'll know I was right. I'm a happy man," Cross said as he was forcibly removed from the courtroom. At the hearing, Cross argued that the killings were justified because Jews control the government and the media, reports Reuters, which notes that all three people he killed were Christians who happened to be outside Jewish centers. The victims were Terri LaManno, 53, Reat Underwood, 14, and Underwood's grandfather, 69-year-old William Corporon. Corporon's son Will was among the family members who spoke at the hearing. "You are a coward," he said, per Reuters. "You are not a patriot. You are a disgrace to the uniform you wore," he told Cross, a Vietnam vet who became a "grand dragon" in the KKK. Before the verdict, Underwood's mother, Mindy Corporon, played a video of her son singing the national anthem, prompting many in the courtroom to sing along, CNN reports. Kansas hasn't executed anybody since 1965 and it may not get the chance to execute Cross: The St. Louis Post-Dispatch reports that he has chronic emphysema and only a few years to live.