Northern Arizona University shooter Steven Jones' retrial has been moved to next March on the grounds that a member of his defense team is medically unable to process the trial.

The retrial was initially set to begin later this month.

A judge declared Jones' case a mistrial in May after the jury could not reach a consensus.

Jones has admitted that he shot four other NAU students, killing one, in October 2015, but he has said he did so in self-defense.