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Man charged with killing wife and stepdaughter's husband in Gwinnett County

Here's what we know.

LAWRENCEVILLE, Ga. — UPDATE: Police have identified the suspect as 61-year-old Bernie Mack of Lawrenceville. Mack is being charged with two counts of malice murder and two counts of felony murder, among other charges, for allegedly killing his 61-year-old wife Bridget Mack and the husband of his stepdaughter, 36-year-old Jeremy Santos.

Original story below

Gwinnett County homicide detectives are investigating after two people were found dead near a Lawrenceville subdivision Thursday night. Police said one person is being detained as they investigate.

Police were called to a homicide on Harbor Bay Drive near Fort Martin Way before 7:45 p.m, not far from Tribble Mill Park.

11Alive sent a crew to the area where Chandler Road was blocked off by police tape. Several Gwinnett County patrol vehicles were parked along the street around 9:20 p.m. 

Cpl. Ryan Winderweedle with Gwinnett County Police Department said officers with the department's Bay Creek precinct were called to an aggravated domestic incident around 6:10 p.m. The caller said an individual had been shot, according to Winderweedle.

Officers said they found a woman shot to death inside a home. As they investigated, detectives also found a man dead just up the street outside of a vehicle.

Winderweedle said the caller also provided suspect information. Police have detained a third individual that matches the suspect's description.

Investigators have deemed it a domestic incident that stemmed from an argument, adding there was some sort of relationship between the three people.

Now officers are working to find a motive. They do not believe there are any outstanding suspects at this time.

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