FRANKLIN TOWNSHIP, New Jersey (WABC) -- A police department in New Jersey has been taken over by the Hunterdon County Prosecutor's Office amid a murder-suicide investigation involving a killer who was a New Jersey State trooper.

Investigators say the trooper stalked his ex-girlfriend, veterinarian Lauren Semanchik, followed her to her Franklin Township home, murdered Semanchik and her boyfriend, and then killed himself last week.

The family of Semanchik is preparing for her final farewell this weekend, but her sister feels the Franklin Township Police let them down and did very little to prevent this tragedy. They say a bright light has been taken away.

"My sister was the definition of compassion and empathy, and she just wanted everybody to feel loved," said Semanchik's sister Allis

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