Frazier Glenn Cross, 73, of Aurora, Mo., was charged him with premeditated murder. Photo courtesy of Johnson County Sheriff’s Office

A white supremacist gave a Nazi salute in an Olathe, Kansas, courtroom Monday (Aug. 31) after learning he’d been convicted of fatally shooting a teen, the teen’s grandfather and a woman visiting her mother at two Jewish facilities in Overland Park last year.

Frazier Glenn Miller, also known as Frazier Glenn Cross, said, “I think the fat lady just sang,” as the verdict was announced, KCTV is reporting. Before making his closing statements, Miller, 74, of Aurora, Mo., also wrote on an easel, “Diversity is a code word for white genocide.”

Judge Thomas Kelly Ryan warned Miller that his behavior could cause a mistrial.

It took the jury less than two hours to convict Miller, an avowed anti-Semite who testified that he intended to kill Jewish people, the Kansas City Star is reporting. The three that Cross killed were Christians.

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He was convicted in the April 13, 2014, deaths of Reat Underwood, 14, and his grandfather, William Corporon, 69, at the Jewish Community Center in Overland Park, and Terri Lamanno, 43, at the Village Shalom care center, also in Overland Park.

The jury also found Miller guilty of aggravated assault for pointing a shotgun at a woman and asking if she was Jewish. When she responded that she was not, he put the gun away and left, the Star reports. The jury also found him guilty of firing bullets and shotgun rounds into the Jewish Community Center, according to the Star.

Miller represented himself in the trial, during which the judge reprimanded him for continued objections and requests for additional instructions. Cross is dying of emphysema and said that led him to his actions, according to KCTV.

Cross testified that 48 years ago, his father instilled in him that Jewish people wanted to destroy white people.

Frazier Glenn Cross fatally shot a teen and the teen’s grandfather, and a woman visiting her mother at a retirement center at two Jewish retirement centers in Johnson County, Kansas.

(Melanie Eversley writes for USA Today.)