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Randall Woita died at the scene of the Sept. 21 accident.

On Monday, Cristofer Cazun, who is out of jail on bond, entered guilty pleas to manslaughter -- a killing without malice unintentionally while committing an unlawful act -- and DUI causing serious bodily injury.

In exchange, the prosecutor dismissed a third felony.

When Lancaster County District Judge Stephanie Stacy asked Cazun to say in his own words what he did, he said he drove under the influence.

Of what, she asked.

K2, he said.

Deputy Lancaster County Attorney Christopher Turner said Cazun was driving a Honda Pilot on that Sunday morning when he rear-ended a southbound Chevrolet Avalanche driven by 43-year-old Tammy Shultis of Kearney between Raymond and Mill roads, sending both vehicles rolling.

Witnesses had estimated Cazun's speed at more than 100 mph and said they saw him cross into the center median, then back to the rumble bars on the shoulder shortly before the crash.

When the witnesses topped a hill, they saw the crash, Turner said.

He said Woita, the front passenger in the Avalanche, suffered a massive cut to the left side of his head.

Shultis and her rear passenger, Woita's 18-year-old daughter Rhea, both were taken to a hospital, Rhea with a punctured lung and fractured leg and Shultis with a concussion, Turner said.

Cazun was not injured.

After the crash, a test showed he had no alcohol in his system. He refused to submit a urine sample to test for drugs.

Turner said deputies found a K2 package and pipe near the Pilot. Testing showed the pipe had contained synthetic marijuana and had Cazun's DNA on it.

Now, Cazun, a 2014 graduate of Lincoln Southwest High School, is set for sentencing Sept. 3.

At the time of the crash, he was on probation for robbing a DaVinci's pizza delivery driver at gunpoint in January 2013.