Police are looking for one person after a man and a woman were found dead in an apartment in LaSalle late Tuesday night.

Residents of Des Oblats St. called police at about 10:15 p.m. when they heard the sound of multiple gunshots.

“I called the police. I was scared to, but I was like, ‘What else am I going to do?’ My friends were actually trying to break in as she was screaming to save her. So they could have been killed too,” a neighbour who asked not to be identified told CTV Montreal.

Constable Danny Richer said someone within the home also called 9-1-1, and when police arrived they found the body of a 29-year-old woman who had been shot at least once.

"They also found a man who had been stabbed by a sharp object," said Richer. He was rushed to hospital where doctors were unable to save his life.

The unidentified neighbour said the couple had lived in the apartment for 14 years, that that over the past several months, their relationship appeared to become strained. They frequently argued, and she saw signs that the woman was physically abused.

“I knew he was abusive because I heard him beat her before… and I noticed that she was always nervous and scared,” she said.

She said on Tuesday night, she heard the voice of a second man before the fighting began.

"I heard a guy yelling to stop... I heard him yell, 'Stop you're going to hurt her,'" she said. "And then I heard a whole bunch of banging around, and then gunshots and silence."

The neighbour then called police.

“Devastating, really, really tragic,” she said.

Police have not said if a weapon was found at the scene, nor have they released the identities of the couple aside from saying the man was 30 and the woman was 29.

However police said both people were killed and that nobody committed suicide.

"Major crimes investigators are confirming the 22nd and 23rd murders on our territory," said Const. Richer.

Officers were at the apartment throughout the night, and remained there on Wednesday, combing the apartment and the building's exterior for more clues.

Police say they are looking for at least one other person who was in the apartment and is considered a suspect.