A second suspect was arrested today in last week’s stabbing of two women in the Back Bay, police said.

Boston police arrested 20-year-old Tyler Butler of Brockton this morning, one day after the first suspect was brought into custody, police said.

Butler and Naomi Charles, 26, of Dorchester face two separate cases for the attacks on the two women. In each case, both are charged with assault with intent to murder; assault with a dangerous weapon, to wit, a knife; and assault and battery, said Suffolk district attorney’s spokesman Jake Wark.

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Charles pleaded not guilty to the charges at her arraignment today in Boston Municipal Court. Butler is to be arraigned Thursday in the same court, prosecutors said.

Both suspects are accused of stabbing two 19-year-old women in a violent altercation shortly before 2:30 p.m. on Hereford Street in the Back Bay on Friday. The incident took place between Boylston and Newbury streets, near a Boston fire station, police said.

The two victims were taken to Boston Medical Center and Massachusetts General Hospital with serious stab wounds, police said. They are expected to survive their injuries, said Wark.

Charles was apprehended by Boston police Tuesday near the Edward W. Brooke Courthouse on New Chardon Street in downtown Boston, police said. At that time, police were still searching for a male suspect.

Charles was held on $10,000 bail for each of her cases. She must undergo GPS monitoring if released on bail. She is slated to appear next on April 7, prosecutors said.