Henry Long, who was driving the car that dragged PC Andrew Harper to his death, has been found not guilty of murder.
The 19-year-old had already pleaded guilty to manslaughter.
Press Association has reported that his passengers, Jessie Cole and Albert Bowers, both 18, were also found not guilty of murder but guilty of manslaughter during the hearing at the Old Bailey.
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PC Harper, 28, was killed after while attending reports of a burglary at about 11.30pm on 15 August 2019, close to the A4 Bath Road near Sulhamstead, in Berkshire.
Speaking at the time, Deputy Chief Constable Jason Hogg offered his sympathies to his family.
He said: "Our deepest thoughts at this time are of course with Andrew's friends and family, who are being supported by specially trained family liaison officers.
"Our thoughts also extend to all of Andrew's colleagues within Thames Valley Police.
"As a force we are devastated at the loss of our colleague and will all be supporting each other at this difficult time."
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At the time, PC Harper's wife Lissie penned an open letter to her late husband where she's reflected on their life together.
The note reads: "To my best friend. The kindest, loveliest, most selfless person you will ever meet. You were brave, funny, and always there for anyone who needed it.
"There is not enough paper in the world to even begin to write a tribute for you, but no one deserves it more.
"We had so many plans for the future, you wanted to do it all. My darling boy I do not know how I will be able to survive without you.
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"Anyone who was lucky enough to meet you, whether they knew you as Andrew, Andy, Uncle Mann, Harps or PC Harper...to everyone you are a hero.
"You had the best sense of humour and never took life too seriously. You treasured every moment and always had a smile on your face.
"I want to be angry that your job took you away from us but I know you loved it and always wanted to keep everyone safe, especially me. You went the extra mile whenever you could and genuinely cared for everyone.
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"The lights have dimmed on all of our lives now that you are no longer here, but it's no surprise that even when you're gone, you're still keeping us all going, knowing that you would tell us to carry on and stay strong.
"I can't begin to imagine a life without your silly jokes, size 14 feet, large appetite, big hugs, Sunday roasts, and never faltering positive attitude. You kept me going if I was down and took care of us all until the last.
"Even now I can still hear you nagging me to brush my teeth, get dressed and eat something. We are all feeling so very lost without you but we are trying to be as brave as you were."
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