KALAMAZOO, Mich. (WOOD) — The father of a 3-year-old believed to have died in a hot car near Vicksburg indicated he must have forgotten to drop his son off at day care that day, police reports show.

The child was discovered dead in his father’s SUV on the afternoon of Aug. 13 at a Family Fare in Vicksburg. Police reports from the Kalamazoo County Sheriff’s Office obtained by News 8 show his father told investigators he didn’t know what happened that day.

“I guess I went straight to work,” the report says he told investigators when he was interviewed.

The father arrived at his job at a plant in Brady Township, just outside of the Vicksburg limits, around 6:40 a.m., the reports show. He left around 3 p.m. and then stopped by the Family Fare afterward to get groceries. He was inside for a few minutes and when he came out, he realized his son was still in the car, buckled into in a rear-facing car seat in the driver’s side back seat.

“(He) opened up the back of the vehicle, saw (his son) in the backseat, and did not know how (he) got there,” the police report reads in part.

The boy was dead by then.

The father started crying, the police reports show. A bystander told a store worker to call 911.

The death was believed to have been the result of prolonged heat exhaustion. The police reports noted a temperature of 83 degrees, and Storm Team 8 says the high in the area that day was 84.

“(O)n an 80 degree day, the temperature inside of a car can rise 20 degrees in as little as 10 minutes and it keeps getting hotter with each passing minute,” Emma Youngs, Bronson Healthcare Childhood Injury Prevention and Safe Kids coordinator, told News 8 in an email in August.

The father told investigators nothing was different about the family’s routine that day. He said he wasn’t running late, he had been sleeping normally and he doesn’t use sleeping aids or recreational drugs or drink.

“(The father) said he never checks the backseat when he gets to work,” the police report said. “(He) said he always rolls the windows up at work.”

News 8 reached out to the Kalamazoo County Prosecutor’s Office on Friday asking if the father would face any charges, but was told the prosecutor was out of the office until Monday.