LAPLACE — Djuan Mackey, 26, of Gretna was arrested Wednesday in connection with a double homicide from October 2015 in LaPlace that resulted in the deaths of Travis Gregoire and Sierra Gregoire.

For the past two and half years, Sheriff Mike Tregre said, St. John Sheriff’s Office detectives kept the investigation active.

“Our detectives didn’t give up,” Tregre said. “Through the years, they worked just as hard as they did the day of the shooting to solve this case.”

On Oct. 5, at approximately 2 a.m., deputies responded to a home in the 400 block of State Street in LaPlace in reference to a shooting. Upon arrival, deputies located two victims, identified as cousins Travis Gregoire, 23, and Sierra Gregoire, 18.

Both victims died at local hospitals.

A third male victim was shot and survived.

Over the course of the investigation, detectives identified Mackey, a convicted felon for firearms and drug-related violations, as a suspect in the triple shooting and obtained a judicial warrant for his arrest.

With the assistance of the U.S. Marshals Fugitive Task Force, officers arrested Mackey without incident at a residence in Slidell on Wednesday.

He was booked with two counts of second degree murder and one count of attempted second degree murder.

Police said a motive is unknown at this time, and the investigation remains active.

Police said Mackey has been involved in numerous violent encounters, including a double shooting when Mackey was shot May 13 at a home on English Colony Drive in LaPlace. Another shooting in which Mackey was shot occurred Aug. 1, 2015, at a residence on Belle Pointe Boulevard in LaPlace.

Anyone with information regarding any of these shootings is encouraged to call the St. John Sheriff’s Office TIPS line at 985-359-TIPS or Crimestoppers at 504-822-1111. Those who call Crimestoppers do not have to testify and may qualify for a cash reward.

Tips can be submitted at stjohnsheriff.org/submitatip.php.