The 16-year-old von Grabow appeared in custody for Tuesday's arraignment hearing in Boulder County District Court, where prosecutors formally filed charges against him as an adult — including one count of first-degree murder.
First-degree murder is a Class 1 felony that is eligible for the death penalty or a mandatory sentence of life in prison without parole. But because of von Grabow's age, he would receive life in prison with a possibility of parole after 40 years if convicted.
He also was charged with four counts of attempted first-degree murder, two counts of menacing, three counts of stalking, criminal extortion, criminal mischief, third-degree assault and harassment.
Prosecutors also filed three new crime-of-violence sentence enhancers and dropped aggravated juvenile charges since von Grabow is now being charged as an adult.
Because von Grabow is not eligible for bond on the first-degree murder charge, his attorneys did not ask Boulder District Judge Bruce Langer to set a bond on the remaining charges.
Defense attorney Mike Rafik asked for a new arraignment in June, saying they had just finished the lengthy transfer hearing last week.
"There are quite a few things that defense needs to do now that the transfer hearing is complete," Rafik said.
Deputy District Attorney Adrian Van Nice objected to the late date, asking for a much earlier arraignment so prosecutors could begin progressing toward a potential trial.
Langer set an arraignment on June 7, but told the defense attorneys he wanted them to be prepared to enter a plea at that date.
Von Grabow is accused of killing Makayla Grote, 20, at her apartment in Longmont, though police believe he had intended to kill Grote's younger sister, who prosecutors say was on the teen's "death list."
Prosecutors say the sister was showering when Grote was killed and was able to lock herself in another room.
Grote, her younger sister and von Grabow all attended Green Mountain High School in Lakewood.
Von Grabow was 15 at the time of the stabbing.