A security guard working at the STEM School Highlands Ranch in May 2019 testified Friday one of the shooters told him, “You need to kill me.”

The testimony from guard Shamson Sundara came on the sixth day of the trial of Devon Erickson, 20, who faces 46 separate criminal charges, including first-degree murder, as well as two sentence enhancers. Alec McKinney, 16 at the time of the May 7, 2019 shooting, pleaded guilty last year to murder and other charges for his role in the crime, and is serving a life sentence.

“I heard on the radio ‘someone has been shot, come to 107 now,” Sundara told jurors. “I immediately grabbed the weapon under my shirt and moved to 107.”

That weapon was a Glock 19 handgun, he said.

Sundara saw a student, he later identified as McKinney, “trying to get into a classroom.” It was room 107.

When Sundara yelled at him, McKinney “immediately pointed the gun to his (own) head.”

“I yelled ‘Security! Security! Do not point that gun at me. Put the weapon down and get on the floor.’ He complied with my commands,” Sundara said.

As Sundara questioned McKinney about other guns or shooters, he responded: “We have more guns than you. We’re going to kill you. You need to kill me.”

Sundara handcuffed him and led him down the hall. He saw another person come down the corridor with “what looked like a rifle” and a uniform he didn’t recognize.

“I didn’t recognize the person and fired my weapon in that direction,” he said.

He walked jurors through videos showing him handcuffing McKinney, then another of the police jumping back from a corner after he shot.

Friday’s witnesses also included several more students who were in the room when the shooting took place, and two teachers. One, Lauren Harper, was teaching her British Literature class in room 107 where the shooting took place. The other, Gabriela Leddy, was in the next room.

“I heard a big yell, but no actual words I could make out,” Leddy told jurors. “I was walking that way to help Lauren Harper, who was a friend of mine, when I heard a loud boom. I didn’t know what it was, but then I was sprayed with a white powder I later realized was dry wall. I saw the bullet hole then realized what was going on.”

As far as what happened in room 107, Harper testified, “I remember seeing the gun as he turned around to face us, and it struck me as weird.”

“All of a sudden, the guitar case hits the ground, out comes the gun, and I hear an elevated voice yell, ‘Nobody (explicative) move,’” she said.

Harper, who got emotional several times but declined to take a break when asked if she was OK, demonstrated for jurors how Erickson raised the gun to waist level, arm extended, pointed at the room.

She then saw Erickson “being slammed up against the whiteboard.” She fell back against a bookcase and hit the ground, where she closed her eyes and stayed still. She described the chaos of gunshots, screaming and a scuffle.

Kendrick Castillo, 18, was killed that day. Several students testified he was the one who rushed Erickson and slammed him against the wall in an effort to disarm him.

When Harper saw a door opening, she raced out with a student. There she saw McKinney struggling with another student, who was trying to get his gun. She put him in a headlock and he appeared to drop the gun. But then she hesitated.

“At one moment I was weighing my options while the struggle was going on. One of the options was to do McKinney harm. But I wasn’t 100% sure, and you can’t hurt a student, so I let him go,” she said through tears.

Erickson’s trial is scheduled for one month. It resumes in District Judge Theresa Slade’s courtroom Monday.