Paul Walker died before he could complete "Fast & Furious 7."
"It's definitely a good thing," Walker's co-star Ludacris told Ellen DeGeneres about their work. "It's scary how much they look like him and sound like him."
The actor/rapper, 36, told DeGeneres that the loss of Walker, who died in a car accident last November, is still being felt on set.
"It's definitely very difficult," he said. "We're all still healing from it and there's a void when we go to set, but we understand we have to carry on his legacy."