A suspect has been arrested in the fatal weekend shooting of a San Antonio police detective.

San Antonio Police Chief William McManus said Monday evening that 31-year-old Otis Tyrone McCain was arrested without incident in the Sunday night killing of Detective Benjamin Marconi. He was arrested around 4:30 p.m. Monday after the car he was driving was stopped on Interstate 10.

Flowers, balloons and notes are placed at a makeshift memorial for slain San Antonio police officer Benjamin Marconi, 50, a 20-year veteran of the force, on Monday in San Antonio. Associated Press/Eric Gay

Police officers inspect a truck undercover police officers were riding in when it was shot through the windshield by a suspect they were following in St. Louis on Monday. The police and man engaged in a shootout that ended with the suspect being fatally shot. David Carson//St. Louis Post-Dispatch

Police officers inspect a truck undercover police officers were riding when it was shot through the windshield by a suspect they were following in the 6500 block of Smiley Avenue Monday, Nov. 21, 2016, in St. Louis. The police and man engaged in a shootout in the neighborhood that ended with the suspect being fatally shot. The man who police shot is suspected of shooting a police officer earlier in the night and several other crimes in both St. Louis County and St. Louis city. (David Carson//St. Louis Post-Dispatch via AP) David Carson//St. Louis Post-Dispatch

McManus had said previously that dashcam video from Marconi’s patrol vehicle provided “a lot of information” for investigators about his death.

Marconi was shot as a he sat in his vehicle after making a traffic stop. Authorities have said a gunman walked up to Marconi’s driver’s-side window and fired.

Marconi was writing a ticket for a motorist at the time. Investigators have said that driver was not connected to the shooter.

In Missouri, a St. Louis police sergeant was shot twice in the face Sunday evening while he sat in traffic in a marked police vehicle. The sergeant was released from the hospital Monday.

Police officers were also shot and injured during traffic stops in Sanibel, Florida, and Gladstone, Missouri, on Sunday night, but authorities have not suggested these were targeted attacks.

The shootings come less than five months after a black military veteran killed five white officers at a protest in Dallas – the deadliest day for American law enforcement since Sept. 11, 2001.

Race was a factor in the Dallas attack, but police have not said if race played a part in any of the attacks on Sunday. In San Antonio, police say the suspect is black and the officer was white. In St. Louis, the suspect was black. Police have not released the race of the officer shot.

In San Antonia, surveillance video shows the suspect at police headquarters about four hours before Marconi was shot. The suspect asked a desk clerk a question but left before receiving an answer, said McManus, who declined to say what the man asked.

“I don’t know why he was in headquarters. We have some ideas,” he said.

St. Louis Police Chief Sam Dotson declined to name the 46-year-old officer on his force who was shot in the face Sunday evening, but said he is a married father of three who has been with the department for about 20 years.

“This officer was driving down the road and was ambushed by an individual who pointed a gun at him from inside of his car and shot out the police officer’s window,” Dotson said during a news conference.

The suspect, identified as 19-year-old George P. Bush III, was wanted for questioning in recent violent crimes that included several robberies, a carjacking and perhaps a killing, Dotson said. He didn’t elaborate. Police said Bush’s weapon was recovered from the scene.

“We believe he knew he was good for those crimes and that we were looking for him,” Dotson said. “That’s why he aggressively attacked a police officer.”

Police said Bush was later killed in a shootout with officers.

At least two other police officers were also shot in other cities Sunday night, but it wasn’t clear whether the incidents were targeted attacks.

An officer with the Gladstone, Missouri, police department near Kansas City was shot, while the suspect was shot and killed. Gladstone police said Monday that the officer, whose name has not been released, is out of surgery and expected to recover.

Sanibel, Florida, officer Jarred Ciccone was shot in the shoulder during a traffic stop, and was treated for his injuries and released. Authorities said they arrested Jon Webster Hay, 49, about 90 minutes after the shooting. They said he was booked into jail on an attempted murder charge Monday once he was released from the hospital.

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