Florida jogger Arielle Valdes told her family she was hearing “demon voices” before she left home on her final run last week, new documents revealed.

Valdes, 21, was found dead in the Caloosahatchee River in North Fort Myers on Monday — five days after she was first reported missing when she failed to return home from an evening jog.

When authorities responded to her family’s home shortly before 8:30 p.m. Aug. 28, Valdes’ mother said she “had been acting strange for the last couple of days,” according to a police report obtained by The Post.

Valdes — who was training for a marathon and often went on long runs — had also mentioned “that she was hearing demon voices in her head,” the report said.

Valdes’ mom became concerned when she left the house with no shoes on after her mom suggested she share her location with the family since she had darted off and been found at a local electrical plant earlier that day.

The young woman’s mom believed Valdes “is having some sort of mental crisis and believes she needs help,” the report explained.

The Lee County Sheriff’s Office started combing the area for Valdes, who was reportedly wearing a gray hoodie and tan shorts.

She did not have her phone or ID on her, the report specified.

A drone was deployed by 9 p.m., and a K9 unit was on the lookout less than an hour later.

Valdes’ body was found by investigators Monday morning in the mangroves between the Edison and Caloosahatchee bridges.

There was no evidence of foul play, the sheriff’s office told The Post in a statement.

“Our hearts remain with Arielle’s family and loved ones as they navigate the coming days during this time of grief,” the office added.

“Arielle was missing for five agonizing days, during which countless community members came together to search for her, showing incredible strength, love, and solidarity,” her heartbroken family said in a statement on their GoFundMe page.

“While we hoped and prayed for her safe return, we now face the unimaginable reality of having to say goodbye.”

As of Wednesday morning, the fundraiser for Valdes’ memorial and other expenses had raised over $8,000 of its $10,000 goal.