He died yesterday. Police said they have seized three vehicles involved in the mishap.
The probe was only to rule out any foul play in the mishap as some suspicions had been raised by some quarters.
However, investigation so far has revealed that it was an accident.
A case under 304A (causing death by negligence) has been registered, they said.
Pillai's younger brother, who was driving the car, has also said the family was not suspecting any foul play and it was an accident.
Javed Sheikh was among the four alleged terrorists shot dead on the outskirts of Ahmedabad on June 15, 2004.
The others gunned down were 19-year-old college girl Ishrat Jahan from Mumbra in Maharashtra, Zeeshan Johar and Amzad Rana.
The police termed them Lashkar-e-Taiba operatives allegedly on a mission to kill then Gujarat Chief Minister Narendra Modi.
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