Van Dyke faces two counts of first-degree murder, 16 counts of aggravated battery and one count of official misconduct for the shooting and killing of the black teenager. The white officer faces up to life in prison if convicted.
Video of the shooting sparked protests, a Justice Department civil rights investigation, criticism of the city's mayor and eventually the ouster of the police superintendent.
Van Dyke is the first Chicago police officer to be charged with a first-degree murder since 1980.
McDonald's face was expressionless – "His eyes were just bugging out of his head "- as the teenager kept" advancing "on him, holding a knife. Standing by 1
"He waved the knife from his lower right side, upwards, across his body, towards my left shoulder,"
McDonald. The officer said he was shot and killed.
Still lay wounded, Van Dyke said. McDonald reloaded – as he was trained to do – and fired at the knife, he said.
"I could see him starting to push his left hand off the ground Dyke said. His eyes are still bugged out. "
He told jurors," I just kept looking at the knife, and I shot at it knife. "
The prosecution said Van Dyke fired unnecessarily within six seconds after arriving at the scene, McDonald 16 times.
The shooting was on a grainy police dashcam video. Van Dyke said he was fired in self-defense after McDonald lunged at him with the knife. McDonald walks away from police, but does not charge them.
McDonald's caught the knife.
"You've been here for several days and watched." several videos. … Have you ever seen Laquan McDonald do that on one of those videos? " Gleason asked.
Van Dyke said the dashcam video of the shooting and animated recreation of the shooting did not show his perspective.
The McDonald's McDonald's McDonald's McDonald's walking video shows McDonald's walking up a fence on his right-hand side of Van Dyke's squad car pulls up, facing the teenager's left.  CNN's Susannah Cullinane contributed to this report.