Boulder shooting suspect in court.

The suspect in the Colorado supermarket shooting appeared in court for the first time Thursday, and a defense attorney immediately asked that he receive a mental health evaluation before the case against him proceeds.

Ahmad Al Aliwi Alissa, 21, did not speak during the hearing except to say “yes” to a question from the judge, who advised him that he is charged with murder in the attack that killed 10 people, including a Boulder police officer. Alissa is also charged with attempted murder for allegedly shooting at another police officer, who was unhurt.

Boulder County District Attorney Michael Dougherty said authorities planned to file more charges. He did not elaborate.

Alissa did not enter a plea, which will come later in the judicial process. He has been jailed without bail.

The young man entered court in a wheelchair, presumably because of a gunshot wound to the leg that he suffered Monday in a gunbattle with police. He appeared alert and attentive, moving his knees from side to side, his eyes darting back and forth from his lawyers to the judge. He wore a mask and purple, short-sleeved coveralls.

His attorney, public defender Kathryn Herold, provided no details about his health. At Herold’s request, Alissa’s next hearing will not be scheduled for two to three months to allow the defense to evaluate his mental state and evidence collected by investigators.

“Our position is we cannot do anything until we are able to fully assess Mr. Alissa’s mental illness,” Herold said, adding that the defense cannot begin that assessment until it receives evidence from investigators.