By Hank Tester

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MIAMI BEACH (CBSMiami) – Miami Beach Police say the shooter in Saturday’s brazen murder turned himself in Thursday afternoon.

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Police identified the shooter as Alan Michael Alt.

Police say Alt, 32, surrendered himself at the police station and brought with him the gun believed to have been used in the crime.

“We were able to negotiate this surrender through his attorney, thankfully, peacefully,” said Miami Beach Police Spokesperson Ernesto Rodriguez. “We also recovered the firearm we believe was used in the incident.”

Police will now run tests on that firearm to confirm it is the murder weapon.

Surveillance video captured a man firing one shot near the seawall and 13th Street on Miami Beach. (Source: Miami Beach Police)

CBS4 News cameras rolled as a Jeep arrived at Miami Beach Police headquarters before 1:30 pm.

Police blocked off the streets around the building as an officer was seen instructing the driver of the Jeep to drive into a secure parking garage.

It was clear that officers were not taking any chances with a man suspected in this violent crime.

Police say it’s still unclear why Alt shot the victim after some sort of confrontation Saturday night and why he shot in the direction of several other people sitting along the seawall on 13th Street. Rodriguez released few details about the case other than saying:

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“The subject and the victims in these cases do not know each other,” he said.

Investigators recovered a bunch of surveillance video of Alt during his time before and after the shooting. Those videos helped police track his movements.

“We were able track him throughout most of the evening and later identify him and that’s through a lot of interviews with people who knew him and tips we received,” Rodriguez said.

Police also say they tracked him through license plate readers set up in the city.

“If we have basically a license plate that technology tracks the vehicles throughout our city,” Rodriguez said. “We have entry points, exit points, we have multiple cameras through our city.”

Police say Alt has a criminal record and court records show arrests for battery, possession of cannabis and resisting arrest without violence. Police say Alt was honorably discharged from the US Navy.

Rodriguez said this loss of life is tragic and they’re grateful there wasn’t more bloodshed Saturday night.

“It’s a life lost unnecessarily and we’re proud of the investigative work,” Rodriguez said. “It’s a combination of the community helping and good old fashioned police work.”

Police have not formally identified the murder victim. They tell CBS 4 News that they have been unable so far to notify his family.

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We’re told that Alt invoked his rights and did not speak with investigators. He is expected to be booked in at tonight at TGK on charges of second degree murder and aggravated battery with a firearm.