LEAWOOD, Kansas (AP) — 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 two Jewish facilities in the mostly affluent suburb of Kansas City 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.

Cross, 73, has been jailed awaiting charges that investigators said could come as early as Tuesday.

Mindy Losen said her father, a 69-year-old physician, and her son were headed for the “KC Superstar” competition, an American Idol-like singing contest for high school students.

Kansas shooting victims Dr. William Lewis Corporon and Reat Griffin Underwood (Photo credit: Twitter)

Kansas shooting victims Dr. William Lewis Corporon and Reat Griffin Underwood (Photo credit: Twitter)

Corporon’s grandson had waited three years for the tryouts. Dressed in a coat and tie, 14-year-old son Reat Griffin Underwood practiced two songs — “On the Street Where You Live” from “My Fair Lady” and “You Will Miss Me When I’m Gone” — before getting a kiss and “I love you” from his mom and leaving with the grandpa he knew as “Popeye.”

Losen went to a lacrosse game but found it canceled, then headed to the community center to watch her son perform.

What she saw instead was a scene of horror: Her father and son had been randomly ambushed, each shot in the head outside the Jewish Community Center of Greater Kansas City.

Losen said she spotted her father’s pickup truck, its doors open and her dad motionless. At first, she thought he had suffered a heart attack but soon knew otherwise.

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

Losen 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.

She said she later learned that neither her son nor father had felt any pain or had seen the attack coming.

Terri LaManno was killed Sunday, April 13, 2014, while visiting her mother at Village Shalom assisted living facility in Leawood, Kan. (photo credit: AP Photo/Courtesy of The LaManno family via Kansas City Star)

Terri LaManno was killed Sunday, April 13, 2014, while visiting her mother at Village Shalom assisted living facility in Leawood, Kan. (photo credit: AP Photo/Courtesy of The LaManno family via Kansas City Star)

Minutes later, LaManno was gunned down outside the Village Shalom assisted living center.

LaManno, 53, was eulogized Monday as a devoted Catholic wife with two college-age children. Her St. Peter’s Parish described her as “a gentle and giving woman,” as did the Children’s Center for the Visually Impaired, where LaManno worked as an occupational therapist for eight years.

“She was honestly one of the kindest people I’ve met,” said Nicola Heskett, the center’s executive director. “She was always gracious, always full of gratitude.”

Copyright 2014 The Associated Press.