Yanez shot him seconds after Castile volunteered during a traffic stop that he was carrying a firearm.
The jury also re-watched video shot and livestreamed on Facebook by Castile's girlfriend, Diamond Reynolds.
No explanation was given for the request. The jury also requested transcripts of squad auto audio and of Yanez's statement to state investigators the day after the shooting, but the judge denied the request because defense attorneys did not agree.
Both videos were played at trial.
They repeatedly played the squad vehicle video and pointed out that Yanez never told Castile to "freeze" or stop moving. "That wasn't my intention", Yanez said, according to local outlet WCCO.
Reynolds' video of the gruesome aftermath of the shooting was shared widely, and included her statements that Castile hadn't been reaching for his gun. Reynolds said she showed the video because she did not trust police. The officer said he was on alert for a pair of suspects in a convenience store robbery and thought Castile resembled one of the suspects. Castile had a permit for the weapon.
Paulsen went back to the brief conversation Castile had with Yanez that night - and the fact Castile told him he had a firearm, as the dash camera showed - as further proof of why it wouldn't make sense for Castile to be motivated to pull it out and use it.
"Did I want to shoot Mr. Castile at all?" Before Castile finishes that sentence, Yanez has his hand on his own gun and is pulling it out of the holster.
A central question at trial has been what Yanez saw before firing seven times, barely a minute after he approached the auto and just seconds after Castile said he had a gun.
Defense attorneys highlighted inconsistencies in what is said on her video and in statements later to police. Officers direct Reynolds out of the auto.
Government websites hacked with pro-Islamic State rant
The websites for the Richland County Sheriff in Wisconsin and the Aberdeen City Council in Scotland are among those targeted. It was not immediately clear who the group was or whether it was genuinely affiliated with ISIS.
The most serious charge, second-degree manslaughter, the instructions noted, is defined as killing someone through what's known as "culpable negligence". In his interview with the BCA, Yanez said, "I know he had an object.it was dark".
Yanez never said he was sure he saw a gun, until he testified, Paulsen said.
The prosecution also used evidence from Castile's autopsy.
Castile had THC, a component of marijuana, in his blood when he died. The two sides called competing experts earlier who disagreed over whether Castile was intoxicated.
Yanez, who is Latino, is charged with second-degree manslaughter, punishable by up to 10 years in prison, and with two lesser counts of endangering the safety of Reynolds and her daughter for firing his gun into the auto near them.
Prosecutor Jeff Paulsen, on cross-examination, asserted that "the ultimate question" in the case was whether Yanez saw a gun. Was Castile putting his hands up, like she said in her video, or was it just one hand?
She added, "This is no longer about Philando". The rest are white, and no jurors are Latino. In it, she explains she's waiting for a jury to reach a verdict against St. Anthony police officer Jeronimo (yeh-RON'-ih-moh) Yanez, who shot her son during a traffic stop.
A Minnesota jury has ended its first partial day of deliberations without a verdict in the trial of a police officer who fatally shot a black motorist past year during a traffic stop.
Defense attorneys have argued that Yanez's actions were reasonable.
Clarence Castile, uncle of Philando Castile, leaves the Ramsey County Courthouse in St. Paul, Minn. on Monday, June 12, 2017.