Donovan McFarlane, 31, was charged with criminal possession of a firearm and police say he is cooperating in an investigation into the murder of a couple with a 4-month-old baby
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Chase Garrett and Christina Dang
Christina Dang and Chase Garrett
| Credit: GoFundMe

Police have made an arrest in connection with a dispute over a dog that police say ended in a double homicide of a Hartford, Conn., couple who were fatally shot Sunday night.

Authorities confirm Donovan McFarlane, 31, walked into the Hartford Police Department Tuesday to speak with detectives after learning he had been identified as a "person of interest" in the shooting that killed Chase Garrett, 39, and Christina Dang, 27.

The couple were parents to a 4-month-old child.

A third person — a woman — was injured in the shooting, and continues to receive treatment at a Hartford hospital.

According to police, McFarlane was also wounded in the Sunday evening shooting.

Donovan McFarlane
Donovan McFarlane
| Credit: Hartford Police Department

Police say McFarlane has been cooperating with detectives.

Hartford Police Chief Jason Thody told reporters Monday the shooting followed a minor dispute over a dog that escalated.

However, Thody could not say what the exact nature of that dispute was.

At this point, McFarlane has only been charged with criminal possession of a firearm.

McFarlane has yet to plead to that charge, and PEOPLE was unable to determine the name of his attorney Thursday morning.

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It was unclear Thursday if additional charges would be forthcoming.

Police continue to investigate the deadly incident.