Nicole "Nikki" Catsouras (March 4, 1988 – October 31, 2006), who died at the age of 18 in a high-speed car crash in Lake Forest, California, after losing control of her father's Porsche 911 Carrera and colliding with a tollbooth. Photographs of Catsouras's badly disfigured body were published on the internet, leading her family to take legal action for the distress this caused.

On October 31, 2006, Catsouras and her parents had lunch together at the family home in Ladera Ranch, California. Afterwards, her father, Christos Catsouras, left for work, while her mother, Lesli, stayed at home. About 10 minutes later, her mother saw Catsouras backing out of the garage in Christos' Porsche 911 Carrera, which she was not allowed to drive. Lesli called her husband, and he began driving around trying to find his daughter. While doing so, he called 9-1-1, apparently just minutes before the accident, and was put on hold. When they called him back, the operator informed him of the accident.

Catsouras was traveling on the 241 Toll Road in Lake Forest at approximately 1:38 pm, when she clipped a Honda Civic that she was attempting to pass on the right at over 100 miles per hour (160 km/h). The Porsche crossed the road's broad median, which lacks a physical barrier on that segment, and crashed into an unmanned concrete toll booth near the Alton Parkway interchange. Catsouras was killed on impact. Toxicological tests revealed traces of cocaine in Catsouras's body, but no alcohol. Catsouras was later buried in the Pacific View Memorial Park in the Corona del Mar neighborhood of Newport Beach, in Orange County, California.

According to Newsweek, the Catsouras "accident was so gruesome the coroner wouldn't allow her parents to identify their daughter's body". Photographs of the scene were taken by California Highway Patrol (CHP) officers as part of standard fatal traffic collision procedures. These photographs were forwarded to colleagues and leaked onto the Internet.

Two CHP employees, Aaron Reich and Thomas O'Donnell, admitted to releasing the photographs in violation of CHP policy. O'Donnell stated in interviews that he only sent the photos to his own e-mail account for viewing at a later time, while Reich stated that he had forwarded the pictures to four other people. Catsouras's parents discovered the photographs posted online. The pictures had gained much attention, including a fake MySpace tribute page that contained links to the photographs. People anonymously e-mailed copies of the photos to the Catsouras family with misleading subject headers, in one case captioning the photo sent to the father with the words "Woohoo Daddy! Hey daddy, I'm still alive." This led the Catsouras family to withdraw from Internet use and, concerned that their youngest daughter might be taunted with the photographs, to begin homeschooling her.

On January 30, 2012, the CHP reached a settlement with the Catsouras family, under which the family received approximately $2.37 million in damages. CHP spokesperson Fran Clader commented, "No amount of money can compensate for the pain suffered by the Catsouras family. We have reached an agreement with the family to save the substantial costs that would be incurred by continuing the litigation and a jury trial. We hope that, with this legal issue resolved, the Catsouras family can close this chapter."

Since 2021, the Catsouras family has been living in an undisclosed location in California due to the ongoing harassment, threats, and death threats they have received following the lawsuit.