The Theory of Everything star, who played Yelchin's British lover in the 2011 movie, is still devastated by his freak car accident death in June (16), admitting she can't understand how the Star Trek actor was killed.

The actor lost his life when he was pinned between a brick pillar and his vehicle after it rolled backwards down the steep driveway of his home in the San Fernando Valley, California.

Opening up about her loss in the new issue of The Hollywood Reporter, Felicity says, "It’s been devastating. It doesn’t feel like there’s any justice or there’s no way of understanding it, really. It’s just been a very difficult time for his family. They’re very dignified, beautiful people.

"He was just like no one else. He really was a unique soul."

Yelchin's parents, Victor and Irina Yelchin, are currently suing executives at Fiat Chrysler, alleging the gear selector in their 27-year-old son's Jeep Grand Cherokee was defective.

Bosses at the car company have filed a response to the lawsuit, asking the judge to remove them from the case because they had nothing to do with the accident.

They list a host of reasons they should not be held responsible for Yelchin's death, including the fact that the actor's "misuse, misapplication, or damage" of his 2015 Jeep Grand Cherokee led to the accident that killed him.

Following the accident, Fiat Chrysler chiefs launched an investigation into Yelchin's incident.

After the Yelchins filed their lawsuit against the company, their attorney Gary A. Dordick, revealed a recall letter for the vehicle was sent to the actor a month before his death and a week after he was killed.

"The safety recall was way too little and way too late," Dordick said. "We hope this lawsuit will teach them a lesson."