Chris Harris
February 12, 2018 06:13 PM

Authorities in Massachusetts have filed murder and attempted murder charges against a man who they say killed his 20-year-old girlfriend before going to a family party. When he arrived at the party, he allegedly stabbed both of his parents.

A prosecution source confirms to PEOPLE Benjamin Walsh remains in custody as the sole suspect in the murder of Olivia Bergstrom.

Bergstrom’s body was found in Walsh’s apartment in Needham on Saturday evening. She had been stabbed to death, the prosecution source tells PEOPLE.

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Millis Police arrested the 24-year-old Walsh Saturday night after he allegedly stabbed both of his parents during a family gathering at the Primavera restaurant.

His parents are expected to recover from the attack.

The prosecution source tells PEOPLE relatives subdued Walsh after he allegedly attacked his parents.

They tied him up until police arrived. There is no known motive at this time.

According to the prosecution source, Walsh had never been in legal trouble before.

Detectives have recovered a knife they say was used in both crimes.

Walsh has pleaded not guilty to the charges and it is unclear whether he has obtained an attorney. He is being held without bond.

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In a statement obtained by PEOPLE, Olivia’s grandfather said the family she leaves behind is beyond devastated.

“Olivia was a smart, vibrant, beautiful young woman with a bright future ahead of her,” reads the statement from Paul Bergstrom. “She was a beloved daughter, sister, granddaughter, niece, and friend. Olivia was a lover of animals who never met a horse she couldn’t win over. She was passionate about living a healthy life. She had a dog named Scarlett. She loved her family fiercely.

“Our hearts are broken at the thought of Olivia not being in our lives, taken from us and her future in a way we cannot comprehend,” the statement continues. “We know her spirit remains with us and we will do everything in our power to keep her memory alive and celebrate the short time we had the privilege of having her in our lives. We ask for our privacy and your respect at this time as our family begins the long journey of rebuilding our lives.”

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