A 24-year-old man is accused of stabbing his parents in a Millis restaurant and is expected to be also be charged with his girlfriend's murder.
Bergstrom was found dead in Walsh's apartment Saturday after police were first called to a Millis restaurant where investigators say he attacked his two parents with a knife.
The stabbings happened during a family party.
Soon after, police conducted a welfare check at Walsh's multi-family home in Needham where he and his girlfriend reportedly lived together.
They are expected to survive.
Walsh immediately anxious that the victim had been his son's girlfriend, Olivia Bergstrom, whom he called "the sweetest kid, " in an interview Sunday at his home.
Walsh is in the custody of Millis police and facing "multiple charges", according to Norfolk District Attorney Michael W. Morrissey, who declined to elaborate on what the charges will be.
"It is anticipated that the defendant will be arraigned in Dedham District Court for the Needham murder subsequent to his arraignment in Wrentham District Court", the district attorney's office said.
Police believe Walsh has no criminal past.
"We have recovered a knife that is of interest to us and that's all we'll say", Morrissey said.
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