Police believe the suspect, 54-year-old Shane Killian, killed his entire family at a home on the 400 block of Kitty Hawk Road on July 10.
They believe Shane killed his wife, father-in-law, mother-in-law, his 6-year-old and 1-year-old sons.
The victims have been identified as:
Miguel Angel Carcamo Ramirez, 70 year old
Brenda Natali Morales, 36 year old
William Andrew Killian, 6 year old
Wesley James Killian, 1 year old
A fifth victim has not been identified.
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One-year-old Wesley James Killian was the initial survivor, critically injured in the domestic shooting, but succumbed to his injuries on Monday.
Shane Killian briefly appeared in court on July 12 and has a criminal past.
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He served 60 days in jail for misdemeanor assault on a government official in North Carolina in 2011.
The incident involved a gun at a gas station, which led to a high-speed chase.
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The motive is still under investigation.
Killian is expected to be arraigned in court on July 22.