Mac Robinson drove past a fatal crash in Matamata on Monday night before glancing back and realising the car involved was his wife's.
Horse-racing enthusiast Joy Robinson, 58, died when the car she was driving collided with a horse at 6.20pm on Hopkins Rd, south of Matamata.
The car hit the horse before travelling across a driveway and stopping at a tree.
Mrs Robinson's husband, Mac, had been dropping a friend home who lived around the corner from the crash when he saw the accident.
"I didn't realise it was her until we were just driving past and I glanced back and saw the back of the car ..," Mr Robinson told the Herald. He said his heart dropped once he realised.