TEANECK, N.J. (CBSNewYork) — A man stabbed his mother and brother to death inside their home in Teaneck, authorities said.

Keith Knight, 60, was taken into custody Thursday morning, Bergen County Prosecutor John Molinelli said. He made his initial court appearance late Thursday and was ordered held on $2 million bail by Bergen County Judge Susan J. Steele, prosecutors said.

Investigators spent hours collecting bags of evidence, including computers, from the home on Ward Plaza where authorities said the incident took place.

It’s not clear yet who first called police, but they arrived around 11 p.m. Wednesday to a bloody scene, CBS2’s Janelle Burrell reported.

Authorities said Knight stabbed his mother, 84-year-old Victoria Knight, and younger brother, 52-year-old Ronald Knight, to death.

Family friends are unable to make sense of their loss.

“I can’t believe it,” said friend Waddell Spearman. “Keith has been here since about 1970 — everybody in the neighborhood knows Keith. He’s a good guy, so for this to happen, it’s very shocking”

“I was surprised when I came over and realized who it was,” another man said.

Keith Knight was known in the neighborhood for cutting lawns and helping out, WCBS 880’s Levon Putney reported.

Friends say there were no apparent warning signs, but add that Keith Knight had been in a bad accident years ago and never fully recovered.

“He was involved in a motorcycle accident, so I think it was mental illness,” said Waddell Spearman.

But friends say there was never any indication he’d hurt anyone, let alone his own family.

“Never violent,” another man said.

“You would never expect — you know, you hear that all the time, but I was just really saddened and very shocked to hear about what happened,” said Kendra Spearman.

“It’s horrible, and it’s tragic, and it’s an awful thing,” she added.

Investigators late Thursday were working to figure out what happened in the moments leading up to the incident as the family and community mourns.