Police were investigating two fatal shootings at North Central Expressway and Midpark Road early Wednesday.

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DALLAS -- Dallas police are investigating after an off-duty officer shot and killed a suspect in the murder of another person at the intersection of North Central Expressway and Midpark Road early Wednesday morning.

According to police and witnesses, the officer was working a security job at a Walmart store when there was a commotion at the gas station in the parking lot just before 1 a.m. between people in two vehicles.

One shot was fired, police say, and one of the vehicles crashed into parked cars. A man was discovered dead inside.

The suspects then took off and the officer chased them into the parking lot of a Denny's restaurant across the street.

The officer says he spotted a gun and told the suspect to put it down, but he didn't listen. The officer fired his weapon and shot the suspect, who took off in his car again -- eventually crashing into parked cars. He was pronounced dead at the scene.

Police say the officer felt his safety was at risk.

Dallas police have now been involved in at least six deadly shooting incidents this month.

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