The court hearing to which Nikolas Cruz, accused of the massacre at Marjory Stoneman Douglas High School in Parkland, Florida, was due to appear today, was postponed to June 21, local media reported.
No reasons have been given for the postponement of the appearance of Cruz, 19, in the courts of Fort Lauderdale, a city 30 miles north of Miami.
Cruz was arrested within hours of the 17-person massacre perpetrated with an assault rifle on February 14 at the Parkland school, from which he had been expelled for disciplinary offenses.
The young man confessed to the police being the author and, according to his lawyers, will plead guilty to all the charges in order to be sentenced to life imprisonment and not to the death penalty.
The date for the start of the trial has not yet been set.
On April 27, at a hearing before Judge Elizabeth Scherer, Cruz gave up having an expedited process.
Generally, a person accused of a serious crime is required to go to trial before six months of the arrest.
Cruz, arrested without bail, faces 17 counts of premeditated murder and as many counts of attempted murder.