"There's a terrible car accident -- the car flipped, it's on its side," one caller says. "It's two vehicles and a Walmart truck."
Tracy Morgan's fiancée Megan Wollover also spoke out for the first time Tuesday since the accident.
"Thank you so much for the outpour of support following the accident. Your well wishes mean more than you can imagine, and I know that Tracy can feel the love and positive energy," she said in a statement on her Facebook. "Along with everyone else, I too hope that Jeff and Ardie have full and speedy recoveries, And to Jimmy Mack, you will truly by missed. You have always been very special to Tracy and all of us, and the world will not be the same without you. Please continue to keep Tracy and the others in your thoughts and prayers throughout the recovery."
Woolover and Morgan have a daughter together, 11-month-old Maven Sonae.
According to CNN, Walmart truck driver Kevin Roper -- who was charged with vehicular homicide and assault by auto in the crash on the New Jersey turnpike -- was awake for more than 24 consecutive hours before the incident.