Grigsby was born in 1987 and was in a relationship with David Joseph Pedersen. Both had records and both had adopted white supremacist beliefs in and after prison.
Between September 26 and October 3, 2011 they killed four people. Pedersen's father, David Jones Pedersen, fifty-six, and stepmother, Leslie Mae Pedersen, sixty-nine, were killed at their home in Everett, Washington. Cody Myers, nineteen, was shot in Oregon; they later said they had believed him to be Jewish, which he was not. Reginald Clark, fifty-three, a Black man, was shot in California. They took the victims' cars.
They were arrested in California on October 5, 2011.
Grigsby pleaded guilty in federal court and was sentenced to life without parole on July 15, 2014. Pedersen received life terms and consecutive sentences.
The killings of Myers and Clark were charged and sentenced as hate crimes, and the pair's own statements about their motives were extensive and were used in evidence. This is a spree over eight days rather than a serial case, and it is in the archive under that description.