SAN ANTONIO – San Antonio police have arrested a suspect in the ambush shooting of Detective Benjamin Marconi.

Otis Tyrone McKane, 31, was taken into custody around 4:30 p.m. Monday. He was in a vehicle with a woman and 2-year-old child when police pulled him over.

Chief William McManus said that McKane is the same person seen in surveillance footage at police headquarters the day of the shooting.

Marconi was gunned down Sunday while sitting in his car and writing a ticket.

Chief McManus said Monday morning that SAPD had developed a suspect from surveillance video from the entrance of Public Safety Headquarters.

McManus said the suspect briefly visited the police station four hours before the shooting, speaking to a desk clerk. McManus did not say what was discussed. He said the dashcam video provided "a lot of information," but he provided no details.

The Bexar County District Attorney Nico LaHood said he will be charged with capital murder.

"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.

Texas Gov. Greg Abbott issued a statement asking everyone in Texas to pray for the Marconis' loved ones as they deal with "this unimaginable tragedy." Abbott urged the Legislature to pass his Police Protection Act, which would classify attacks against law enforcement as hate crimes.

"Attacks against law enforcement officers will not be tolerated in Texas and must be met with swift justice," Abbott 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.