Family, Friends Remember Victims of Kansas Shooting Spree

April 15, 2014— -- William Lewis Corporon was taking his grandson to a singing audition at a community center. Terri LaManno was visiting her mother at a nearby retirement complex.

It was a seemingly quiet spring Sunday, but neither Corporon nor his grandson or LaManno made it home alive, their lives cut short by a shooting spree that targeted the two Jewish facilities in the mostly affluent suburb of Kansas City, Kan., known as Overland Park.

Investigators have not revealed any motive for the attack, though suspected gunman Frazier Glenn Cross had a long history of white-supremacist activities and anti-Semitic beliefs. Never mind that Corporon and his grandson were Methodist, and LaManno was Catholic.

WATCH: Witness to Shooting: ‘I Thought I Was Dreaming’

Cross, 73, who also goes by the last name Miller, will face charges today of premeditated murder and federal hate crimes violations.

The shooting victims include Corporon's grandson Reat Underwood, 14, who loved to sing. He was headed for the “KC Superstar” competition, an “American Idol”-like singing contest for high school students. Reat practiced two songs -- “On the Street Where You Live” from “My Fair Lady” and “You Will Miss Me When I’m Gone.”

His mother, Mindy Corporon, drove to the community center to watch her son perform. But when she got there, she spotted her father’s pickup truck, its doors open and her dad motionless. First, she thought he had suffered a heart attack. She soon knew otherwise.

“Very quickly, I realized it wasn’t that, and I knew my dad was in heaven,” she said.

WATCH: Teen Victim ‘Brought Smiles to Everybody’

Corporon ran around the vehicle and saw her son on the ground, two strangers attending to him. Before she could get closer, a man approached her, hugged her tightly and led her from the scene.

Reat, 14, had just received his driver’s permit and was already an organ donor, she said.

“He was with us for a wonderful 14 years. He had a really full life for a 14-year-old and we’re very blessed."

Minutes after the grandfather and grandson’s deaths, LaManno, 53, was gunned down outside the Village Shalom assisted living center. She visited there every Sunday to see her mother.

Her family released a statement, calling her “the best mother, wife, sister and friend that anyone could ask for. She lived for God and the people she loved.”

The Associated Press contributed to this report.