STAMFORD - A 31-year-old Stamford woman was killed on the Merritt Parkway Sunday morning after losing control of her car and striking trees off the highway. The accident happened shortly after 9 a.m. Sunday between Exits 35 and 36. The victim was identified as Bianca Diaz, of River Place. According to State Police, Diaz was traveling northbound in the left lane when for unknown reasons lost control of her 1997 Honda Accord. “Once out of control, the vehicle traveled across the right lane and entered the grass area located along the right-hand shoulder of the highway,” according to the accident summary.