One driving force affecting Brauchler's decisions will be the motive for the heinous crime.

Little was known about Erickson's accomplice. While court documents listed the younger suspect as Maya Elizabeth McKinney, he is known as Alec McKinney, and "identified as transgender and had been bullied for it," according to Denver's ABC television affiliate.

"Bullying is very common, and with teenagers can have volatile repercussions," said Eleanora Brown, a woman's studies major at Prescott College in Arizona.

"What makes this case unusual is that one of the chief antagonists is a woman who identifies herself as a man - it's usually boys using guns that cause these killings," Brown said.

Twenty years and one month ago, two teenagers killed 12 students and a teacher and injured 21 others in a mass shooting at Columbine High School, located just over 11 km away in affluent Littleton, Colorado.

This time, a lengthy trial awaits the two suspects, and more contentious dialogue will be heard regarding bullying, gun control, mental health, arming teachers, and even why more money was not allocated to the local sheriff's department for more law enforcement protection at the STEM school.

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