Jenner was involved in a 3-car pileup on the Pacific Coast Highway in Malibu on February 7 that killed 69-year-old widower Kim Howe.
The two adult stepchildren of Howe filed a wrongful death lawsuit Friday claiming that Jenner was "reckless, careless, and negligent" when his Cadillac Escalade slammed into Howe's Lexus sedan, causing it to collide with a Hummer, People reports. Howe was pronounced dead at the scene of the crash.
Damages sought by Dana Redmond and William Howe are not specified in the lawsuit, but it states they have sustained enormous damages.
Initial speculation around the crash included allegations of Jenner texting while driving, which has since been disproven, as well as fleeing the pursuit of paparazzi. Jenner passed a field sobriety test at the scene of the crash.
Following the incident, Jenner released a statement expressing sympathy for the family.
"My heartfelt and deepest sympathies go out to the family and loved ones, and to all of those who were involved or injured in this terrible accident," the former Olympian said. "It is a devastating tragedy and I cannot pretend to imagine what this family is going through at this time."
At the time of the crash, experts predicted Jenner may be faced with a hefty legal fine but would not likely serve any jail time for vehicular manslaughter. Jenner has not been charged in the case.
Jenner's publicist, Alan Nierob, declined to provide comment after the announcement of the lawsuit that was filed in Los Angeles.
The crash remains under investigation by the L.A. County Sheriff's Department.