A Brazilian woman accused of being in the United States illegally has been cleared of negligent motor vehicle homicide charges in the death of a Dennis florist. A judge determined this week that Maria Veras-Alves, 59, was not negligent when she struck and killed Symen ‘‘Jim’’ Kooy, 76, in April because she was driving under the speed limit and within marked lanes. Veras-Alves, who was living in Dennis, remains in detention as she awaits a deportation hearing for allegedly overstaying her visa. Kooy, a Dutch immigrant and the owner of Blossoms Florist of Cape Cod, died four days later at Massachusetts General Hospital after he was struck while walking on Route 6A in Dennis. Kooy’s brother-in-law told the Cape Cod Times that the family respects the judge’s decision.