Last year, a man was found guilty of driving a car to a Christmas parade near Milwaukee that killed six people.
Darrell Brooks was convicted of six counts of manslaughter for the Nov. 21 attack in Waukesha, Wisconsin.
Among the dead were an eight-year-old boy who marched with his baseball team and three members of the dancing granny group.
More than 60 people were injured.
As the verdict was read, someone in the courtroom shouted “Go to hell and burn you bastard”.
The 40-year-old initially pleaded guilty, citing mental illness, but withdrew his guilty plea in September.
The following month, he fired his lawyers and began defending himself.
During the trial, he put up a capricious defense that included heated arguments with the judge, denial of his name and tortuous cross-examination.
At one point, after being transferred to another courtroom, he took off his shirt and sat topless on a table with his back to the camera.
Another day, he hid behind a box containing legal documents.
Brooks hinted that his car had a gas failure, he had no intention of harming anyone, and honked his horn to warn bystanders.
However, a vehicle inspector testified that the Ford Escape SUV was in good working order.
Prosecutors said Brooks ran away after an argument with his girlfriend, but has no idea why he drove to the march, other than being provoked.
He was on bail at the time on domestic violence charges.
“When you ride the parade route and roll over the kids … your intent is well known. It’s not accidental,” Waukesha County District Attorney Su Oper said in closing arguments.
She said he refused to stop to show that he intended to kill.
Brooks now faces a mandatory life sentence for each count of homicide.