Tulsa, Oklahoma: A 3-year-old brother and 4-year-old sister have died together after their father left them alone in his truck for 5 straight hours in 32 degrees Celsius heat.

3-year-old Ryan Dennis and 4-year-old Teagan were found in the footwell of Dustin Lee Dennis’ vehicle after he went away for a nap.

They were found on Saturday in Tulsa, Oklahoma.

The Tulsa police reportedly received a call after Dennis said that he could not find his children.

He said that he took a nap after returning from the store and when he woke.

He found the children on the floor his truck before moving them into the living room.

The 31-year-old was arrested at the scene and was charged with 2 counts of 2nd-degree murder.

The police report said:

The children had not been checked on for nearly five hours during the time they were locked inside the vehicle.

The 2 siblings had no previous medical conditions but the exact cause of there were not been released.

The bodies of the 3-year-old boy and 4-year-old girl were identified by a member of the family a day after they died.

The Tulsa Police Department is looking into video taken by a neighbor that shows Dennis leaving the truck and locking the doors without getting the 2 kids out.

The father of the children did not have full custody of the 2 kids.

Before the 2 kids died, the father said:

Two in the morning up watching my kids sleep, I can’t believe they’re mine, I love them so much and nobody in this world could ever make me feel as loved as they do. The other day I was so depressed because I just missed them, and I got to thinking of when they get older and become adults. I hope our bond only grows stronger, I hope they always want to call me or see me just to talk or ask for advice. I can’t imagine this world without them.

Dennis, the father of the 2 kids, is currently being held inside the Tulsa County Jail on a $750,000 bond.