Waterloo Regional Police have now laid a charge following a collision in Cambridge on Monday afternoon.
Around 1 p.m. that day, a cyclist was hit by a vehicle in the area of Elgin Street North and Samuelson Street.
Police allege a vehicle was travelling at a high rate of speed, when it left the road, hitting the cyclist.
A 73-year-old Cambridge man was airlifted to a hospital outside of the region with serious injuries.
On Friday, police charged a 19-year-old Cambridge man with dangerous operation of a motor vehicle causing bodily harm.