New York maximum-security prison escapee Richard Matt wrote a letter to his daughter three days before he broke out saying he would meet with her.

The letter was postmarked days before the June 6 prison break, and it was delivered to her via the U.S. Postal Service on June 9, The Buffalo News reported.

"I always promised you I would see you on the outside," Matt wrote in the letter. He then gave a hint that he was planning to see her by saying that he was a man of his word.

Matt kept in touch with his daughter regularly, a fact known by his longtime friend Gregory Durandetto, who said that Matt's daughter maintained communication with him because she had "some degree of care" for her father, according to Buffalo News.

A few months before the escape, Matt began to communicate with his daughter through Joyce Mitchell, who supervised the prison's tailor shop. Mitchell reportedly contacted Matt's daughter through text messages and calls, giving her updates about her father's health and condition inside the prison, according to The Guardian.

Mitchell supplied the escaped convicts with hacksaws hidden in frozen meat. She was also supposed to drive the getaway car, but she eventually backed out in a panic.

While Matt's daughter admitted receiving the letter and communicating with Mitchell regarding her father, authorities believe she was not aware of her father's planned prison escape. They said she was fully cooperative during the investigation.

"Matt asked that (Mitchell) provide his daughter with the updates. There was nothing suspicious in those exchanges. Nothing about the planned escape was mentioned," an official said, Buffalo News reported.

Authorities also said that the daughter requested for round-the-clock police protection for her Buffalo home after news broke out of her father's prison escape.

Richard Matt died on June 26 when he was shot on the head by a U.S. Customs and Border Protection agent after he refused to put down the shotgun he was holding, according to Reuters.