Tesla has faced a string of lawsuits over the last five years stemming from fatal crashes involving cars equipped with its Autopilot driver-assist system.

The automaker has settled some of the lawsuits and others have been dismissed, allowing the company to avoid any legal judgments about Autopilot’s safety and whether it is flawed.

But a new case that is set to begin in federal court in Miami on Monday is the first to go to a jury trial, representing a serious threat to Tesla, its self-driving technology and its reputation.

The suit stems from a 2019 crash of a Tesla Model S sedan driven at night on a two-lane road in South Florida, with the Autopilot engaged. When the driver dropped his cellphone and bent to look for it, the car crashed into a parked sport-utility vehicle, killing one pedestrian and injuring another.

The case, which is being heard in the U.S. District Court for the Southern District of Florida, was filed by the family of Naibel Benavides, who was killed in the crash, and her boyfriend, Dillon Angulo, who survived with grave injuries.

Documents in the case indicate that Tesla’s attorneys plan to argue that Autopilot was not fully in control of the car at the time of the crash and that the driver, George Brian McGee, was solely responsible. Data from the car shows he had his foot on the accelerator, pushing its speed to 62 miles per hour, above the posted limit of 45 m.p.h. Pressing the accelerator overrode the cruise control part of Autopilot, which is designed to brake for obstacles or other vehicles.