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Prosecution expert says video counters Ohio officer's story

CINCINNATI (AP) - A video analysis expert says footage from a police officer's body camera contradicts his story of what happened before he fired a fatal shot during a traffic stop.

Grant Fredericks testified for the prosecution Monday in the murder retrial of former University of Cincinnati officer Ray Tensing in the 2015 shooting of Sam DuBose, an unarmed black motorist. He first broke down the footage frame-by-frame. A prosecutor then asked Fredericks to compare the video to the white officer's account to police investigators.

Fredericks said its images were contrary to Tensing's claim that his arm was stuck and he was being dragged.

The Spokane, Washington-based expert will continue on the stand Tuesday.

Earlier, a University of Cincinnati police officer testified the gunshot came after the sound of tires squealing.

Ray Tensing, center, listens to the opening statement by his defense attorney Stewart Mathews during his retrial Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During the opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Ray Tensing, center, speaks to his defense attorney Stewart Mathews, right, before opening statements in Tensing's retrial Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Assistant prosecutor Seth Tieger, right, shows documents to defense attorney Stewart Mathews, center, during the retrial of Ray Tensing, left, on Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Assistant prosecutor Stacey DeGraffenreid, right, questions University of Cincinnati police Lt. Tim Barge after opening statements in the retrial of Ray Tensing, second from left, joined by defense attorney Stewart Mathews, third from, on Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Bishop Bobby Hilton, center, watches police body camera footage during Ray Tensing's retrial Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while defense attorney Stewart Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Assistant prosecutor Seth Tieger, right, asks University of Cincinnati police officer Phillip Kidd, left, about the police department's equipment during Ray Tensing's retrial Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while defense attorney Stewart Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
Defense attorney Stewart Mathews, right, cross-examines University of Cincinnati police Lt. Tim Barge during the retrial of Ray Tensing, second from left, on Thursday, June 8, 2017, at the Hamilton County Courthouse in Cincinnati. During opening statements in the former University of Cincinnati police officer's retrial, prosecutor Stacey DeGraffenreid told Ohio jurors that evidence will show the 2015 shooting of unarmed black motorist Sam DuBose was clearly murder, while Mathews said Tensing feared for his life. (Cara Owsley/The Cincinnati Enquirer via AP, Pool) The Associated Press
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