McKinney is pictured above. (Image courtesy of Instagram)

Lawyers for the second suspect in the Colorado school shooting, Maya McKinney, who is listed in court records as a female, asked the court to use the pronoun "he."

The 16-year-old McKinney is transgender and was transitioning from female to male at the time of Tuesday’s shooting at the STEM School Highlands Ranch in Highlands Ranch, Colo., that left one student dead and eight others wounded. McKinney reportedly identifies as a male and goes by the name Alec.

[ Read more: One of the two suspects in the Colorado school shooting is female, reportedly transgender]

He appeared in court Wednesday, shackled at the wrists and ankles. Arapahoe County District Attorney George Brauchler said that he still has not decided whether to charge McKinney as an adult. In Colorado, 16 is the youngest age that prosecutors can file adult charges.

McKinney is being held for murder and attempted murder, along with 18-year-old Devon Erickson. The two were arrested after students fought back on attempts to shoot up the school. The student who died, Kendrick Castillo, is being hailed as a hero after he was killed attempting to lunge at the gunman.

McKinney is due back in court on Friday.