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He died at the San Antonio Military Medical Center shortly after the shooting, according to police.
As Marconi, a 20-year veteran of the force, wrote a ticket from inside his car, a black vehicle pulled up behind him, the chief said.
The driver then got out and walked up to the Marconi’s opened car window, blasting one gunshot to his head and following another, which also struck him in the head, according to McManus.
After the suspect shot Marconi, he walked back to his car and drove into the south parking lot of police headquarters where he fled the scene from the west side of the building, he said.
McManus reassured that the photo of a black Sedan with chrome rims, which was shared by the police department on social media, is the suspected vehicle in the investigation.
The suspect, who was last seen wearing a gray shirt and black pants and was clean shaven, may have been driving the identified car during the shooting, police said.
Officers are “putting the pieces together in this capital murder case,” to find a motive for the killing, he said.
Police consider the suspect, whose name has not been released, “extremely dangerous,” and “a clear threat to law enforcement and the public,” the chief said.
“It’s always difficult, especially in this day and age where police are being targeted on the streets,” McManus said, adding that cops are searching tirelessly for the “dangerous” individual before he attacks more officers.
“It’s everyone’s worst nightmare. You never want to see anything like this happen,” he said.
San Antonio Mayor Ivy Taylor called it a “somber day” and said she was “floored” when McManus sent her an urgent message about Marconi’s death as she was exiting Sunday church services.
“This type of senseless violence is unacceptable,” the mayor said.
Meanwhile, President-elect Donald Trump took the time from meeting with his cabinet candidates to address the San Antonio shooting as “terrible.”
The officer’s death comes after an armed ex-con, Manuel Rosales, 35, killed NYPD Sgt. Paul Tuozzolo, 41, by fatally blasting him in the head and chest during a shootout in the Bronx on Nov. 5.
(An NYPD sergeant was killed Nov. 5th in a broad-daylight gun battle in the Bronx that left a second cop wounded and a heavily-armed robbery suspect dead, sources said. Courtesy of the New York Daily News and YouTube)
After he shot Tuozzolo, police fired back at Rosales where he was pronounced dead at the scene.
Five months prior, a gunman killed five Dallas officers “ambush style” who were working a protest in response to the shootings of black men in Louisiana and Minnesota.
In what appears to be Marconi’s Twitter account, he showed solidarity for the five slain Dallas officers by posting a photo of a “Pray for Dallas” shirt under a headline that read “San Antonio stands with Dallas.”
Texas Gov. Greg Abbott issued condolences to the officer’s family and declared that attacks against law enforcement should be looked at as hate crimes.
“We ask that all Texans join us in praying for the officer’s loved ones as they deal with the aftermath of this unimaginable tragedy,” Abbott said in a statement.
“Attacks against law enforcement officers will not be tolerated in Texas and must be met with swift justice… making targeted attacks against law enforcement a hate crime.”
Secretary of Housing and Urban Development Julian Castro, who was former mayor of San Antonio, also expressed his condolences via Twitter.
“My deepest condolences and prayers for the loved ones of the SAPD officer who was senselessly shot and killed today while serving our city,” Castro wrote.
“Most families will be celebrating the holidays,” McManus said, “SAPD will be burying one of its own because of an ultimate act of cowardice.”