Joi “SJ” Harris, a stuntwoman and reportedly the first African-American female road racer, died on the set of Deadpool 2 on Monday morning after losing control of her motorcycle and crashing into the Shaw Tower in Vancouver, British Columbia, People reports. She was the stunt double for Zazie Beetz, who plays the comic-book character Domino. Police told the Vancouver Sun that Harris was treated in an ambulance but died on the scene. The crew of Canada’s Global News was by the Tower at the time of the accident, reporting that she successfully completed the stunt about four times but lost control of the motorcycle on the fifth try. Since the character doesn’t wear a helmet, Harris did not have one on at the time.

Per People, Harris began her moto career in Brooklyn and was an accomplished racer who advocated for women of color in the field, billing herself as “the first licensed African-American woman in U.S. history to actively compete in sanctioned motorcycle road racing events.” In 2015, she posted four videos of her races on YouTube, including one of her first race crash. Deadpool 2 was her first film as a stunt driver, according to TMZ.

Deadpool 2 star Ryan Reynolds released a short, heartfelt statement confirming Harris’s death on Monday, writing that the cast and crew are “heartbroken, shocked and devastated . . . but recognize nothing can come close to the grief and inexplicable pain her family and loved ones must feel in this moment.”

“I’m deeply saddened by the loss of one of our stunt performers today,” Deadpool 2 director David Leitch told People. “No words can express how I and the rest of the Deadpool 2 crew feel about this tragedy. Our thoughts are with her family, friends, and loved ones in this difficult time.”

On Monday, there were numerous reports about the chaos around Shaw Tower shortly after the crash, though Harris’s name was not immediately released to the press.

“People were running on the sidewalk, the motorcycle comes flying across the street, looks like from a ramp because it was in the air,” one witness told Global News. “[The rider was] standing on the bike, slams into that building, clearly hit and out-of-control and clearly not planned. . . . it was so out-of-control, it looked like an accident.”

Production on Deadpool 2 has been shut down in the meantime, Deadline reports.

On her Web site, per Deadline, Harris once mused that she’s “learned to accept that I am not the greatest rider that exists and that there is always something to learn when on track and pushing limits.“

“Sometimes I’m going to eat it if I’m impatient,” she continued. “Everything takes time. Face your fears—you never know what you can be missing out on.”