john mccallum has apologized for the death of francesca weatherhead .
he was fleeing police when he ran a red light and crashed into her vehicle .
mrs weatherhead , a newlywed 25-year-old , was killed in the collision .
it was later revealed mccallum was a recent parolee with a long rap sheet .
he apologized in court after he was sentenced to at least 20 years ' jail .