The father of 13-year-old Daniel Fitzpatrick, who killed himself after what he said was relentless bullying, posted an emotional video tribute to his son on Facebook Saturday.

“Danny was a kind, gentle little soul. He didn’t have a mean bone in his body,” said the boy’s father, Daniel Fitzpatrick, in an 18-minute video he posted to his Facebook account Saturday morning, just days after his son was found hanged in the attic of the family’s Staten Island home.

In the video, the boy’s father thanked people for the support he’s received in the days after the tragedy, but also spoke out against bullying and lashed out against the “monsters” he said “tormented” his son.

“I hope the memory of what you’ve done to my son is burned in your brain . . . and you suffer as much as he has suffered,” Fitzpatrick said in the video, which has been viewed more than 100,000 times online and shared more than 1,110 times.

The father ended the recording by bidding his son farewell.

“To my son, Daniel, I love you . . . so much that I will be counting the days [until] . . . I get to see you again,” he said, in a voice choked with emotion.

Daniel was found hanged Thursday by his older sister in the family’s attic with a belt wrapped around his neck, published reports said.

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His parents shared with the media a letter they said Daniel wrote in July about being bullied at his school, Holy Angels Catholic Academy in Bay Ridge, Brooklyn. The letter describes a fight Daniel had with another boy and how the school’s administrators didn’t do enough to stop the bullying.

“I gave up,” the letter said. “The teachers . . . they didn’t do anything!”

A spokeswoman for the Diocese of Brooklyn said in an email that Fitzpatrick’s complaints “did not fall upon deaf ears” and that the boy was provided with counseling.

“Conflicts with other students were never ignored. The principal and teachers truly cared for Daniel and did everything in their power to help him,” the spokeswoman said.

A GoFundMe page to pay for the boy’s memorial was created Saturday by the teen’s sister, Eileen Fitzpatrick. More than $80,000 has been raised in just two days, according to the site.

There will be a viewing for Daniel Monday and Tuesday at the Harmon Funeral Home and a service Wednesday at Sacred Heart Roman Catholic Church in Staten Island.