It was a complex and dynamic crime scene in the the parking lot of a Walmart store at North Central Expressway and Midpark Road early Wednesday.

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DALLAS — Police said an off-duty officer shot and killed a fleeing murder suspect early Wednesday morning after he refused to drop his gun.

It was a complex and dynamic crime scene in the the parking lot of a Walmart store at North Central Expressway and Midpark Road. There were many people involved and four distinct locations where evidence was collected.

At times, police struggled to clearly describe what happened. Here's what we know so far:

Officer Jose Gamez, a five-year veteran of the Dallas Police Department, was finishing up an off-duty assignment at the Walmart when a shot was fired between two vehicles at the gas station in the store's parking lot. Investigators said the two men involved apparently knew one another and it may have been a robbery attempt.

Joseph Roling was hit by gunfire; he drove away but later died.

Hope Lindsey identified herself as Roling's finance. "He was everything to me, and he was amazing," she said. "He was a great father. He was everything."

As gunshots rang out, Officer Gamez was coming out of the Walmart. Officials said he saw the activity at the gas station and went to investigate.

After chasing down the second car, driven by a man identified as Sergio Ramos, Gamez approached the suspect,

"As they talked, Officer Gamez observed a firearm begin to protrude from the left shorts pocket of Ramos," said police spokesman Maj. Jeff Cotner. "Officer Gamez gave specific verbal commands to Ramos not to touch the firearm. Ramos reached down, placed his hand on the firearm, at which time Officer Gamez fired his weapon multiple times."

This is the sixth officer-involved shooting in two weeks in Dallas. Mayor Mike Rawlings, though unaware of the specifics of this case, is knowledgeable about the larger issue.

"We've got to make sure everyone's civil rights are taken care of," he said, adding that he's confident that the previous cases did not involve violations of deadly force policy.

Police are still searching for a person who left the shooting scene who is being referred to as an accomplice of Ramos.

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