About 100 people attended a vigil Sunday in Fredericton for a woman who was poisoned four years ago.

Patricia Ann Kucerovsky's death remains unsolved and the victim's family hopes awareness will bring new light to the case.

Kucerovsky was a mother of twin boys and a school teacher.

"It's been very difficult. I had seven sisters. That's a very powerful force. I am less powerful now because I am missing one of my big sisters," Corey Woodside, Kucerovsky's brother, said.

"You don't realize the hole it's going to create in your life until the hole is there and it never closes. It's with you always."

Lori Haggerty, Kucerovsky's and Woodside's sister, says finding her sister's killer is important.

"I don't think we'll feel a sense of closure and peace until we see justice. And we feel as if we don't want her voice to be silenced. And we don't want her death to be just another meaningless statistic," Haggerty said.

When the school teacher died, her death was first attributed to an illness.

Police began quietly investigating three days after her death, and a year later deemed her death "suspicious."

Three years later, Fredericton Police ruled it a homicide — Kucerovsky had been poisoned.

"We are talking about mercury poisoning and very significant levels of mercury in her system," said Const. Rick Mooney in December.

Last December, police made an arrest, but the man was later released.

"Our ultimate goal is to see an arrest in this case, to have the person who took our sister's life in such a violent way, we want to see that person brought to justice," Haggerty said.

To mark the anniversary of her death, friends and community members came to the Capital Exhibit Centre to show their support.

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The 43-year-old teacher was the mother of twin boys. (Tashauna Reid/CBC)

The family has also found support through families of other homicide victims, such as Lynn Gallant-Blackburn, who travelled to Fredericton from Nova Scotia for Sunday's vigil. Her sister Paula Gallant's murder case was solved after five years.

"You do feel a sense of isolation and hopelessness through a journey that long," said Gallant-Blackburn, now a victims' rights advocate.

"But by holding events like this and knowing you have public support and opportunity to renew energy and renew hope and re-motivate you to look into the future and know perhaps a successful conclusion will come."

Police continue to investigate the case.