According to Leong, the woman, who is not yet being identified, died last night and the cause of her death is not yet known by investigators.
The woman and her husband were both hit by a car driven by a 49-year-old woman from Danville around 8:37 p.m. on Saturday night. Police originally reported that the driver was 29-years-old.
[Related article: Husband, Wife Taken to Hospital With 'Severe Injuries' After Being Hit by Car]
Leong says the husband, who is alert, is still hospitalized in serious condition.
"The the investigation into the cause of the collision is continuing," Leong said.
Anyone with information related to the investigation is being asked to contact the Pleasanton Police Department at 925.931.5100.
Repair crews have been working this week on the installation of new "in-pavement" lighting system in the crosswalk where the couple was hit.
[Related article: 'In Pavement' Crosswalk Lights In Process of Being Replaced When Pedestrians Hit]
The 'in pavement" light system, which had been slowly failing since the summer, was scheduled to be fully repaired by Oct. 9 but was delayed "due to some construction availability." The other warning systems were all in place and functioning at the time of the collision, according to city officials.According to the California Highway Patrol, of the 10 collisions reported near the intersection of Santa Rita Road and Francisco Street between the start of 2003 and the end of 2011, two of the accidents involved a car striking a pedestrian and half were the result of unsafe speed on the part of motorists.
[Related article: CHP Stats Show 10 Collisions at Francisco and Santa Rita Road in 9-Year Period]