SAN ANTONIO -- City leaders shared more about the life of Detective Benjamin Marconi who was shot to death in his car.

Police Chief William McManus, Mayor Ivy Taylor joined several other city leaders and officers at the police headquarters to hold a press conference.

Chief McManus said Marconi was a 20-year veteran at the San Antonio Police Department and a detective with the Special Victims Unit.

The San Antonio Police Officers Association president, Mike Helle, knew Marconi personally. He said Marconi leaves behind two adult children.

"Ben was a great guy. People loved him and certainly, he had an aura about him. You had to go out of your way to not like him. So, he's that good of a guy," described Helle.

Helle said all of the officers are in disbelief over his death.

"There's a lot of officers who are dealing with it themselves. Especially coming up to our holidays just makes it even more difficult. I think like the chief had said, while most people are celebrating Thanksgiving, unfortunately, we're going to be burying one of our brothers," said Helle.

Mayor Taylor said she was leaving church when she heard about the death of Marconi.

"When I left church this morning, I checked my phone and saw there was an urgent message from the chief. I was certainly floored by what he told me. On behalf of our city council, several who are here today, and all the citizens of our great city, I'd like to extend my condolences to the family," said Taylor.

Bexar County District Attorney Nico LaHood said the man who is responsible for the detective's death will face a capital murder charge. The punishment is either life in prison or death.

"This is pure evil when you execute an individual in cold blood. There's no motive behind it. There's no justification for something as evil as this," said LaHood.

"It's very hard to find a lot of people who are willing to do this profession, this job, because of everything that we saw today. And especially when you get blindsided by something you never saw coming. But our guys preserver and do it anyways because it's a higher calling,” said Helle. “I don't mean to sound conceited about it but it takes a certain kind of person to put a badge on and do it because you may not make it home.”

The last San Antonio police officer who was shot and killed in the line of duty was Robert Deckard. Back in December 2013, he was chasing robbery suspects in his patrol car when they fired shots at him. Deckard was fatally hit in the head.