CENTENNIAL, Colo. — A defense psychiatrist who found James Holmes was insane when he killed 12 people in an attack on a suburban Denver movie theater spent Friday answering a barrage of questions about his methods.

Dr. Jonathan Woodcock, one of the first defense witnesses to take the stand, interviewed Holmes four days after the July 20, 2012, shooting to determine if he was competent to stand trial and then again earlier this year when he was asked by the defense to testify on Holmes’ sanity.

He said Holmes was so delusional and psychotic as a result of deep-seeded mental illness that he was unable to tell right from wrong when he opened fire on the theater — Colorado’s standard for an insanity verdict.

Woodcock spent two days answering attorneys’ questions before jurors asked more than 30 of their own.

In response to their inquiries, Woodcock reaffirmed his conclusion that Holmes was insane. Holmes’ delusions finally rendered him unable to tell right from wrong, Woodcock said.

During scathing cross-examination by District Attorney George Brauchler, Woodcock said he made his decision without reviewing all of his medical records and after only watching a fraction of hours of interviews with a court-appointed doctor who came to the opposite conclusion.

Brauchler suggested jurors and others in the courtroom who watched all 22 hours of Dr. William Reid’s interview, in which Holmes talked at length about his planning and preparation for the shooting, had observed him longer than Woodcock had.

Brauchler pointed out that Woodcock didn’t talk to Holmes about the crime or his plans for the shooting in either interview and already completed a report concluding he was insane before the second, one-hour interview.

If jurors find that Holmes was insane, Holmes would be committed to a state mental hospital indefinitely. Prosecutors are asking jurors to convict him and sentence him to death.