WOODBURY - The family of a woman who was hit and killed by a Nassau County police car last year is planning to sue the county and the officer who was behind the wheel. Sherry Lang, 64, was fatally struck as she tried to cross Merrick Road in Bellmore back in April 2011. It was around 10:30 p.m. during heavy rain when the accident happened. Ernest Thompson, an on-duty Nassau police officer, was behind the wheel. The initial police report estimated Thompson was going around 30 mph in a 35 mph speed zone at the time of the crash. However, in January, an internal police investigation found that Thompson was actually traveling at 54 mph at the time of impact, and was driving as fast as 60 mph in the seconds before the accident. He was not responding to an emergency at the time, the report says. Now, more than a year later, the Lang family is suing Thompson and Nassau County. They say the department found wrongdoing, but won't tell them what, if any, disciplinary measures have been taken. Relatives say they are still grieving the loss of Lang, who was a wife, mother and grandmother.Bellmore woman struck, killed by police car