BOSTON -- A blind man accused in the stabbing death of a woman in Brighton was ordered held without bail on Wednesday. His family said they saw warning signs that the man was troubled.

Blind Man Arraigned On Murder Charge

Luis A. Marquez, 26, of Brighton, pleaded not guilty in Brighton District Court to a single count of murder in connection with the fatal stabbing of Terri Werner, 56, of Middleborough. Her body was found inside Marquez's basement apartment on Nonantum Street on Tuesday afternoon.

Werner was a former teacher of Marquez's at the Perkins School for the Blind, sources told NewsCenter 5.

Prosecutors said that Boston police responded to a 911 call from a Nonantum Street resident who said a man with a cane had said he just killed someone.

"'I just killed someone,'" prosecutors said Marquez told police.

Prosecutors said Marquez directed officers to his apartment at 73 Nonantum St., where the woman's body was found with multiple trauma to her head, body and chest. The woman was pronounced dead at the scene.

Marquez graduated from the Perkins School in 2002, where he was described as an outstanding student and athlete.

"The Perkins community is stunned and deeply saddened," school spokeswoman Marilyn Ray Buyer said in a statement. "Our prayers and sympathies are with anyone touched by this horrid tragedy."

Marquez's twin brother said he had undergone psychiatric treatment in the last few months.

"From my point of view, they should put him in a psych hospital, evaluate him again and from there, they can get more answers. Right now, I really don't know," Jose Marquez said.

Jose Marquez said he first spotted warning signs two months ago when a trip to Puerto Rico was cut short when his brother had a nervous breakdown.

"He was giving everything away," Jose Marquez said. "He was not in the right mind."

Once back in Boston, the 26-year-old checked into a psychiatric hospital where he was treated for a bipolar disorder and depression, Jose Marquez said.

"They only left him there for a week and they gave him medication. I was like, 'He is not well yet. You guys can't take him out yet, you know what I mean? You guys are supposed to leave him in there for a couple of more days. He is not healthy,'" Jose Marquez said.

In December, Luis Marquez's former fiancée died of cancer, and his seeing-eye dog was deemed too sick to be of any help.

Marquez was an employee at Perkins Press, a small manufacturing facility affiliated with the school. Marquez was suspended from his job immediately following his arrest.

Marquez will return to court on July 9.