Long Island banana mogul Thomas Hoey would routinely beat his girlfriend so viciously that she once scribbled on the back of a photograph, “If you find me dead, Thomas Hoey did it,’’ court papers reveal.

Hoey — to be sentenced in the Manhattan Supreme Court case this week — rained abuse on Alison Bretherick for even the smallest offenses, including not picking up the phone fast enough, prosecutors said.

Bretherick, 29, admitted to a female cousin in January 2010 that she was becoming increasingly scared of Hoey, 46, the documents say.

Bretherick recalled how Hoey smashed her head into walls, chipping her teeth and hitting the side of her head so hard, she lost hearing in her left ear.

She showed her cousin the chilling message she had written on the back of a photo of her grandfather, blaming Hoey should anything happen to her.

Hoey faces up to four years behind bars for a 2012 beating — and up to 11 more after pleading guilty last week in a woman’s death in 2009.

He supplied cocaine to the woman, who fatally overdosed during a wild three-way sex party in a Manhattan hotel room, and delayed calls to 911. In addition, he continued supplying coke to friends and others after her death.

But Bretherick has refused to cooperate with prosecutors, even showing up to court to support him.

The court papers also reveal Hoey’s disturbing courtship of Bretherick.

Bretherick met Hoey, who ran banana importer Long Island Banana Corp., shortly after she moved to New York, the documents show. She had just graduated from the University of Pennsylvania and got accepted into a competitive executive-training program at Macy’s.

In the summer of 2008, she was walking to her Upper East Side apartment when a man — one of Hoey’s bodyguards — stopped her.

“[He] informed her that his boss was inside a nearby restaurant, had seen her walk by and wanted a date with her,” court papers state.

On their first date, Hoey picked her up in a limo and took her to an expensive restaurant, where he “accidentally” spilled food on her, then produced two ready-to-wear outfits he had selected in advance, the papers state.

Bretherick was “intrigued and excited” by “this extravagant courtship style,” prosecutors said.

The pair began seriously dating a short time after.

Bretherick began using a lot of cocaine with Hoey, she admitted to her cousin.

The couple even wore coke-spoon necklaces, and the cousin saw them snort lines in his limo, the papers state.

Despite the warning signs, Bretherick quit her job at Hoey’s urging and moved in with him on East 91st Street.

To cover up all of the abuse, Bretherick began caking on makeup to conceal the many bruises on her face and body, family members said.

Bretherick was at the Kitano Hotel the night of the other woman’s fatal OD but had a fight with Hoey and left with a bandage over her face, court papers state.

Despite her family staging two interventions to save her, Bretherick has stood by Hoey, who has been in police custody since December 2013 for the fatal menage á trois.

In a letter to Justice Daniel Fitzgerald begging him not to issue a restraining order, she wrote, “I savor my trips to see Tom in jail; they are the highlight to my week.”