In a disturbing clip obtained by The Sun, the car speeds away after the hit-and-run crash, leaving a trail of thick white smoke.
A different pedestrian can be seen running across the road in the video, provided by an Uber driver, to escape being struck by the out-of-control vehicle.
Ethan, 28, was found in the Atlanta street after being hit by the vehicle, and later died from his injuries in the hospital, Atlanta police confirmed.
A police spokesperson told The Sun: "A witness at the scene supplied video from a dashcam that shows the suspect vehicle, a gray Jeep Grand Cherokee, immediately after striking Mr McCallister.
"The suspect vehicle continued to drive at a high rate of speed and nearly struck another pedestrian."
Police are asking the public for any information, stating: "Callers do not have to give their name or any identifying information to be eligible for the reward of up to $2,000 for the arrest and indictment of the suspect."
A 911 caller who witnessed the hit and run told the dispatcher: “He went so fast, he hit that guy and the guy just like flew in the air."
They added: "He just hit the guy and ran away."
A service of life was held for Ethan on Friday at Barrett Funeral Home in Cleveland, Georgia.
Bravo star Kim to claim the suspect may have been driving a different car which was "heading north on US-13 parallel to 85N in Piedmont Heights."
She has shared a number of photographs of and Brielle, along with their friend's family asking followers to "keep them in your prayers."
told fans they miss his "huge beautiful smile, constant jokes, cowboy boots and infamous shirts," describing him as "the life of the party."
She added: "One of the most genuine kind-hearted people I have ever known. Always willing to help anyone anywhere. We love you Ethan and I will make sure justice is served. PLEASE HELP."
Don’t Be Tardy star Brielle, 24, mourned the loss of her best friend with an emotional tribute and said she feels "sick to [her] stomach" after his death - and doesn't know how she'll cope without him.
Alongside a series of pictures and videos, she wrote: "Ethan…. I can't believe I’m even writing this. I'm sick sick sick to my stomach.
"You are my happiness my joy my light in this very dark world.. the life of the party and the sweetest soul I’ve been blessed to know.
"You are my best friend. My heart. My everything. There will never be another you. Ever ever ever.
"You came into this world with 1 mission… make people smile. You were damn good at it too. There was never a moment I wasn’t laughing with you!!
"We haven’t spent a weekend apart all year!!! How am I supposed to go anywhere without you? How am I supposed to laugh, smile, GO TO MIAMI OR DRINK 1942 WITHOUT YOU!?
An emotional Brielle added: "God, I love you, Ethan. I really really do. I can’t wait to see you again."
A , with the goal to raise $100K, has been set up for Ethan's funeral by friend Ignacio Vargas, and people have already donated more than $70K.
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A description reads: "The funds will be spent on funeral costs and any extra funds will be allocated to the family of Ethan as they mourn this tragic loss of their beloved son, Ethan."
Anyone with information on the crime is being asked to call 911 or Crime Stoppers Atlanta on the tip line at 404-577-TIPS (8477) or online at .