hi-ott-dentisttrial-852

Christy Natsis was charged in the fatal crash, which happened more than three years ago along Highway 17 near Arnprior, Ont.

An OPP collision investigator admitted he waited more than a year to reveal that he was aware of mistakes made by a fellow officer in a report into the 2011 crash on Highway 17 that killed Bryan Casey of Ottawa.

Pembroke dentist Christy Natsis was charged with impaired driving causing death, dangerous driving causing death and exceeding the legal blood-alcohol limit after her SUV crashed head-on with Casey's pickup truck in March of 2011.

Speaking at her trial on Tuesday in an Ottawa courtroom, OPP Const. Robert Kern admitted fellow crash investigator Const. Shawn Kelly had made mistakes in his investigation but Kern said he didn't notice the mistakes when he reviewed Kelly's work.

mi-ott-brian-casey-350

The family of Bryan Casey, left, is awaiting the end of the criminal trial before it can pursue a civil case against Natsis. (Submitted photo)

Kern said he didn't notice the errors until Kelly testified at Natsis's trial in March 2013.

When defence counsel Michael Edelson cross examined Kern Tuesday, he said he didn't contact crown prosecutors in March to point out his oversight.

Kern said he met with prosecutors last November to prepare him for his testimony.

Edelson repeatedly asked Kern if at that meeting he brought up his oversight in this specific investigation.

"In general terms I would say mistakes can be made in reports like these," Kern responded.

When Justice Neil Kozloff asked Kern to clarify his response, Kern said he hadn't brought up the mistakes in the investigative report.

Natsis's trial began in November 2012 but has been delayed several times for the judge to rule on the admissibility of evidence.

The Crown's case has faced setbacks, most notably when Kozloff ruled breath samples taken from Natsis were inadmissible because her Charter right to legal counsel was violated.