Wichita ? The man suspected of being the BTK strangler was collaborating with a Topeka woman on a book about his life before court officials found out and cut off all of his contact with her.

Kristin Casarona, an oil and gas analyst, said she initially wrote to Dennis Rader offering spiritual support. They exchanged letters, she said in an interview Thursday, and she eventually visited him, going to the jailhouse about 10 times since April.

Rader, 60, of Park City, is accused of killing 10 people in the Wichita area between 1974 and 1991. BTK, which stands for “Bind, Torture, Kill,” taunted media and police with messages. Trial for the former Park City compliance officer is set to begin Monday.

Casarona said she and Rader never talked about the crimes.

“That would be breaking the integrity of the legal system,” she said. “If he was proven guilty, we had planned to do it after the legal proceedings.”

The state has since subpoenaed all her notes and letters, as well as some photographs and cards Rader had given to her to pass along to his family, she said. She also was subpoenaed as a witness in the prosecution’s case against Rader. Judge Gregory Waller has overruled her efforts to fight the subpoena.

Casarona complained that Rader’s lead attorney, Steve Osburn, had interfered, telling Rader “not to sign a deal with me because the day will come when there will be bigger and better deals.” But, she noted, Kansas state law prohibits criminals from profiting by selling their stories.

Osburn did not immediately return a call for comment.

Rader wanted to give his side of the story in the book, Casarona said.

“Everyone sees everything from the bad side,” she said. “There has been a lot of hurt and pain nobody knows about.”

Rader seemed to like the way she looked at things from a Christian perspective, she said, and liked the structure of her writing in her letters.

Early on during his incarceration, Rader’s own family did not visit him and he was very lonely, she said.

“He expressed extreme remorse to what his family is going through,” Casarona said.

Her name was added to the witness list last Friday, and a separate court document filed the same day ordered Rader to have no contact with state witnesses.

In a phone call to KSNW that same day, Rader complained his contact to Casarona had been cut off: “I don’t know if that’s a prosecutor move, a legal move, or what it is – but it’s not a good time to be doing it.”

Casarona acknowledged most people would not understand.

“The person I got to know has become a very good friend of mine,” she said. “There is so much more to this than anyone knows.”

She declined to talk about specifics.

“One of the reasons he wanted me to do this is we established a trust,” Casarona said.

Without elaborating, she also hinted at a growing rift between Rader and his court-appointed attorneys.

“They have done some things that are wrong. … They do not have his best interest at heart.”