Robinson died of compressional asphyxia, and an autopsy showed that he had "significant trauma to the neck and the soft tissue of the neck", Cvitanovich said.
According to the sheriff's office, four undercover narcotics deputies, whom Sheriff Joe Lopinto did not name but identified as white, were surveilling Robinson, a black man, as part of a drug-dealing investigation and followed him to a gas station on Jefferson Highway late last Thursday morning.
"I understand this incident will be under a microscope", Sheriff Joseph Lopinto said at a Monday news conference where the preliminary results of this weekend's autopsy were announced.
"We want the truth to the community", Spiller said.
The sheriff said Robinson embroiled in a struggle with the police, who managed to get him into handcuffs.
Lopinto said Cvitanovich told him of the autopsy report Saturday.
The four drug bust agents have now been placed on administrative leave.
Even so, she said, "I will not go away".
Hester Hilliard, an attorney for Robinson's family, said the sheriff and coroner have acted with "professionalism and transparency".
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Robinson's grieving family is calling for an investigation by an agency other than the local police department. One read "Enough is Enough".
Protesters in Shrewsbury held signs saying "Justice 4 Keeven", "Enuf is Enough", " and "Stop Police Brutality" while singing the gospel hymn Amazing Grace.
Marchers hope their message is heard. He confirmed they're white.
"They were in a fight with this gentleman effecting an arrest", the sheriff said. "It's whether the force was excessive". He also noted police are "not trained" to use the chokehold on suspects, but aren't "forbidden from doing that".
Later, when Lopinto was asked about whether it was in the county's policies to use chokeholds on suspect, the sheriff replied, "From a policy standpoint, we don't train somebody to hit someone with a brick - but if you're fighting for your life and the brick's there, you hit somebody with the brick".
Also in attendance at the news conference was Gaylor Spiller of the local NAACP chapter.
Hours later, Robinson's family led more than 200 neighbors on a march past the spot where her only son died.
She credited Lopinto and Cvitanovich for being open about the autopsy results and the investigation. "I knew he just didn't die because the ozone was high". When the 22-year-old saw detectives at a gas station, he attempted to drive away, but crashed his auto. He abandoned his auto after crashing into two vehicles, then ran from deputies.
Four deputies caught up with him in the backyard of a nearby home, resulting in a physical struggle. The 22-year-old black man, who had a gun in the auto and was suspected of being in possession of heroin, was on the run from the police when he crashed his auto into two Sheriff's Office vehicle.