The Missouri State Highway Patrol, Henry County Sheriff's Office and the Clinton Police Department have checkpoints set up across Clinton.
The vehicle was discovered around 6:30 a.m., but a search of the nearby area and a subsequent search of the suspect's home didn't turn up any leads.
Authorities say the driver began firing at Michael as he approached the vehicle.
Missouri State Highway Patrol spokesman Bill Lowe says the driver of the auto jumped out and fired at Michael.
"We're not sure if any of those rounds struck the suspect, but Officer Michael was fatally wounded", Lowe said.
Video from a second shop, Clinton Convenience Store, shows Mr. McCarthy's auto exiting the parking lot of the Everyday Convenience Store and driving toward the scene of the shooting.
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Michael returned fire, but McCarthy managed to get back into his vehicle and drive away, crashing the auto just two blocks west, officials said. In July 2015, he was charged with unlawful possession of a firearm.
Ian McCarthy has been identified as a person of interest in that shooting.
Police consider McCarthy armed and risky. Officers believe the driver is still on foot somewhere in the Clinton area.
"[Mr Michael] was heroic right to the end".
Michael was a lifelong resident of Clinton and leaves behind a wife and stepsons. "He was protecting his community".
The Kansas City Star reports that McCarthy was allegedly driving a Dodge Nitro. "The time signature for this footage is consistent with Officer Michael's murder".