Austin Harrouff, 25, pleaded not guilty by reason of insanity to two counts of first-degree murder and other charges for the 2016 slayings of John Stevens, 59, and his wife, Michelle Mishcon Stevens, 53.
Harrouff, who attended Florida State University before the attack, will be committed to a secure mental health facility until doctors and a judge agree that he is no longer dangerous.
Mourners exit a memorial service for John Stevens and Michelle Mishcon Stevens in Fort Lauderdale, Fla. on Aug. 19, 2016.
The judge said Harrouff will remain in the Martin County Jail until he is taken to a secure mental health facility monitored by the Florida Department of Children and Families.
His parents had set up an appointment for him to be evaluated, but the attack occurred first.