Warning: This article contains a topic of infant death that some readers may find disturbing.

A one-year-old girl died when her father forgot she was in his car as he went about his day while temperatures climbed.

Baby Olivia Ancelet, of Australia, was locked in the back of the truck while temperatures reached 86°F, and her whereabouts were only found when her father, Etienne Ancelet, arrived at her daycare facility to pick her up at approximately 5.35pm local time yesterday (February 4).

Investigations are underway to determine how Olivia, who celebrated her first birthday in December, died. It is believed that Ancelet had put her in the car and driven her to Jelly Beans Early Learning Centre in Earlwood, a Sydney suburb.

Authorities were summoned to the daycare after reports of a ‘kid being found motionless in a vehicle,’ and when first responders arrived, the youngster was confirmed dead.

After believing he had dropped Olivia off, Ancelet returned to his vehicle hours later to discover the tragic reality.

In a joint statement to news.com.au, Ancelet and Olivia’s mom, Kim Visconti, praised their daughter as the ‘light of our life’ and a sweet and beautiful baby.’.

“We are humbled and appreciative for our time with her. We are horrified by what has happened,” the couple wrote, adding that they ‘do not want this for any parent’.

“Everyone who knew our lovely girl loved her,” they said. “It is an unimaginable time of sorrow for us.”

Roy Gomes, who went to Olivia’s rescue, told Sky News that he heard Ancelet’s desperate pleas and attempted to revive her for five minutes.

“My neighbor came across, and he said, ‘Can you hear that screaming?’ so I turned the lawnmower off,” he further described. “When I arrived, I saw [Ancelet] with the infant in his arms, and he was just panicked.

“We didn’t know what to do,” I said. “Let’s try and give her CPR; do our best.”

Gomes told NewsWire that “[Ancelet] was screaming, poor guy; he kept screaming, saying, ‘I’ve killed my daughter.’.”

“All the neighbors were really good, putting water on her (and) trying to cool her down, because she was obviously still very hot,” he told me.

“She was simply floppy. I didn’t get much sleep last night because I couldn’t stop looking at the small baby’s face, but that’s simply what you do.”

A news conference was held yesterday (February 4), and New South Wales Police Superintendent Christine McDonald stated that leaving a child in a car at any time is risky. Leaving a youngster in a car for a long time can be fatal.

“This is an absolute tragedy.”