The son of a man who was killed in yesterday's shooting at a Jewish center in Overland Park, Kansas, spoke to the media this afternoon.

Dr. William Lewis Corporon died in the parking lot of the Jewish center, while his 14-year-old grandson, Reat Griffin Underwood, died of his injuries at the hospital. They were at the Jewish center so that the high school freshman could try out for a local singing competition.

Authorities have identified the suspected gunman as 73-year-old Frazier Glenn Cross, aka Frazier Glenn Miller. He reportedly had ties to the KKK and other white supremacist groups.

Dr. Corporon's son, Will Corporon, described Miller as "an idiot with a gun," saying it takes a person with "no character to do what was done ... it takes no backbone." He said his father was always spending time with his grandkids, saying he doesn't want to focus on the shooter.

"Our goal is to shine the light on my father and my nephew and hopefully on just the senselessness of these kinds of things. ... I mean, that idiot absolutely knocked a family to its knees for no reason," he said.

Corporon said he believes his father "died doing exactly what he wanted," referring to spending time with one of his grandkids. He said his mom and dad had moved to the area to be closer to their grandchildren.

Watch Corporon's remarks in the video above. Mindy Corporon, who lost her son and father, also spoke at a news conference. Watch it below.