A police officer who was in the area became aware of a collision in his rear view mirror and drove back to discover the badly damaged Peugeot 208.
PC Lawrence Meldrum said the female driver was bleeding from a head wound and seemed “confused and dazed”. She died three weeks later.
Sutherland was spotted walking away, saying he needed time to clear his head.
When the officer caught up with him, he swore and blamed Ms Allan for the crash.
An investigation later found that the anti-lock brakes on Sutherland’s 12-year-old car were not working properly and the battery was not adequately secured.
Prosecutor Adrian Stalker said his driving had been dangerous and was “not just a lack of judgement or momentary inattention”.
He added the accused was “going far too fast” in what was described as a “defective” car.
Sutherland, from Cumbernauld, had previously been on bail, but was remanded in custody as the case was adjourned for pre-sentencing reports.
Sgt Andy Coutts said: “Sutherland’s actions showed a blatant disregard for other road users and the law, and since the incident he has showed no remorse.”