SAN DIEGO >> Two San Diego police officers were shot — one fatally — after a late-night stop turned into a gunfight, triggering a manhunt that led to the capture of one wounded suspect in a ravine and an hours-long SWAT standoff Friday that ended after officers detained a second man who may have been involved.

The shooting came as departments around the country are on high alert following the killing of officers in Dallas and Baton Rouge, Louisiana, this month. San Diego Police Chief Shelley Zimmerman said it was unknown whether the San Diego attack was premeditated.

The chain of events unfolded over more than 12 hours in a blue-collar area of southeastern San Diego with modest single-story homes and streets lined with palm trees.

It started about 11 p.m. Thursday when two veteran gang unit officers in bulletproof vests stopped a person on a street. Almost immediately a shootout ensued and the officers called for backup.

Authorities initially said the officers made a traffic stop involving a motorist, but clarified later that they were still trying to determine whether it was a traffic stop or a stop to check out a pedestrian.

"It happened extremely quickly," Police Chief Shelley Zimmerman said. "From the information that was put out that a stop was being made to that the officers called for emergency cover to when the other officers arrived on scene, we're talking very, very quickly. Seconds to a minute or so."


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Jonathan DeGuzman, a 16-year veteran of the force who was married with two children, suffered multiple gunshot wounds. The 43-year-old died at Scripps Mercy Hospital after doctors' efforts to save him failed.

Wade Irwin, 32, underwent surgery after being shot and was expected to survive, Zimmerman said. His wife was at his side during surgery.

Police swarmed the neighborhood where the shootout happened and quickly captured 52-year-old Jess Gomez in a nearby ravine, Zimmerman said. He was in critical condition Friday with a gunshot wound but was expected to survive. Police gave no further information about Gomez or his role in the shootout except to say he was a suspect.

During the search for a second man described as a "potential" suspect, residents were ordered to stay in their homes throughout the night as San Diego police and officers from other law enforcement agencies scoured yards, streets and alleys. A helicopter hovered over the neighborhood.

About nine hours after the shootout, heavily armed officers surrounded a house about a half-mile (about 1 kilometer) away, one of them using a loudspeaker to urge a man to surrender. Authorities also detonated several devices at the scene to draw him out and used tools to break windows and pound on the roof.

Then, about a dozen heavily armed SWAT officers raced another house about two blocks away, positioning an armored truck and robots outside. The possible suspect wasn't there either.

Zimmerman said late Friday afternoon that officers arrested a man on an unrelated warrant outside the first home surrounded by SWAT officers.

She said police were investigating to see whether 41-year-old Marcus Antonio Cassani had any role in the police shootings.

After visiting Irwin at UC San Diego Medical Center early Friday, Zimmerman told reporters that the officer's prospects for recovery were good. The nine-year veteran of the force had just joined the gang unit in June.

"It's a little bit of a long haul until he makes a full recovery, but the good news is that he is going to survive and he is going to recover," she said.

Earlier, Zimmerman told reporters she knew DeGuzman well.

"I can tell you he is a loving, caring husband, father. Talked about his family all the time," Zimmerman said. "I know him, and this is gut-wrenching. He cared. He came to work every single day wanting to just make a positive difference in the lives of our community and that's why he lost his life."

DeGuzman received the purple heart in 2003 after he was stabbed by a man he had stopped for speeding. The man was convicted of attempted murder on a peace officer in 2004.

San Diego Mayor Kevin Faulconer denounced the shootings.

"I ask all San Diegans and all people across our nation to join together in support of our officers who courageously protect our communities," he said. "We need them and they need us."

Caption 1:

San Diego Police heavily armed police officers surround a house about a half-mile away, urging a man inside to surrender in San Diego Friday, July 29, 2016. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)

Caption 2:

A San Diego Harbor Police officer helps to secure the scene near the corner of 39th Street and Boston Avenue in San Diego near where two San Diego Police officers were shot Thursday night, July 28, 2016. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 3:

This undated photo provided by the San Diego Police Department shows San Diego Police officer Wade Irwin, a nine-year veteran who was wounded in a shooting in San Diego's blue-collar Southcrest area on Thursday, July 28, 2016. A suspect was wounded and taken into custody a short time later and hours later police surrounded a home as they searched for man described as a possible accomplice. (San Diego Police Department via AP)

Caption 4:

This undated photo provided by the San Diego Police Department shows San Diego Police officer Jonathan DeGuzman who was killed in a shooting Thursday, July 28, 2016. DeGuzman, a 16-year veteran, is survived by a wife and two young children. A suspect was wounded and taken into custody a short time later and hours later police surrounded a home as they searched for man described as a possible accomplice. (San Diego Police Department via AP)

Caption 5:

San Diego Police Chief Shelly Zimmerman announces at Scripps Mercy Hospital that two San Diego police officers were shot, one fatally, Friday, July 29, 2016. (David Poller/The San Diego Union-Tribune via AP) User Upload Caption: Police officers gather at the emergency entrance to UCSD Medical Center Hillcrest after two San Diego police officers were shot, one fatally, in the Southcrest neighborhood of San Diego late Friday night.

Caption 6:

San Diego Police and other law enforcement stage, early Friday, July 29, 2016, near the scene of the shooting late Thursday of two San Diego Police officers near South 38th Street in San Diego. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 7:

A San Diego Harbor Police officer helps to secure the scene near the corner of 39th Street and Boston Avenue in San Diego near where two San Diego Police officers were shot Thursday night, July 28, 2016. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 8:

Police cars line the scene near the corner of 39th Street and Boston Avenue in San Diego near where two police officers were shot Thursday night, July 28, 2016. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 9:

San Diego police and other law enforcement stage near the scene of a shooting of two San Diego police officers near South 38th Street in San Diego Thursday night, July 28, 2016. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 10:

San Diego police and other law enforcement stage near the scene of a shooting of two San Diego police officers near South 38th Street in San Diego Thursday night, July 28, 2016. (John Gastaldo/The San Diego Union-Tribune via AP)

Caption 11:

San Diego Police Chief Shelley Zimmerman talks during a news conference in San Diego on Friday, July 29, 2016. Zimmerman has released the names of an officer who was killed in a shooting and a partner who was wounded late Thursday. Zimmerman says the department is seeking "to find answers to the senseless murder and attempted murder of our police officers." (AP Photo/Julie Watson)

Caption 12:

A San Diego Police officer with a police dog waits outside a house with a possible suspect inside Friday, July 29, 2016, in San Diego. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)

Caption 13:

San Diego Police SWAT officers break out windows as they enter a house with a possible suspect inside Friday, July 29, 2016 in San Diego. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)

Caption 14:

San Diego Police SWAT officers prepare to enter house with a possible suspect inside Friday, July 29, 2016, in San Diego. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)

Caption 15:

San Diego Police SWAT officers surround a house with a possible suspect inside Friday, July 29, 2016, in San Diego. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)

Caption 16:

San Diego Police SWAT officers walk around to the back side of a house with a possible suspect inside Friday, July 29, 2016 in San Diego. One San Diego police officer was killed and another was wounded in a shootout following a late-night traffic stop, Friday night. A suspect was wounded and taken into custody a short time later and hours later police surrounded the home as they searched for man described as a possible accomplice. (AP Photo/Denis Poroy)