A drunk driver who killed a Calgary woman and badly injured her disabled son when he plowed into them on a sidewalk has been sentenced to five years in jail.

Darren Coupal has also been banned from driving for 10 years.

Linda Davey, who was 43, was walking with her teenage son, who has cerebral palsy, when they were mowed down in April 2008.

A 30-year-old friend who was with them was also injured.

Coupal pleaded guilty late last year to five charges that included impaired driving causing death and hit and run.

Court heard he was on his way home that night after drinking at a pub.

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