Chris Dawson gave his wife alcohol so that we could get together.
Before his wife went missing, Chris Dawson left love letters for a teenage student at the school where he taught. Some of the letters were signed "God."
Mr. Dawson, who is 73 years old, is on trial in the NSW Supreme Court. He is accused of killing his wife Lynette, who disappeared in 1982 from their home on Sydney's northern beaches.
The man who used to teach and play for the Newtown Jets has pleaded not guilty and said he didn't kill his wife or get rid of her body.
The court has heard that Mr. Dawson and the student started having sexual relations.
The crown prosecution has said that he killed his wife so he could leave with the girl, who can only be called "JC" for legal reasons.
On Wednesday afternoon, JC took the stand as a witness in Mr. Dawson's trial. She told the court that Mr. Dawson had left love notes in her school bag.
JC says that Mr. Dawson started teaching her in 11th grade, but he later told her that he had seen her in the schoolyard the year before and moved himself to teach one of her classes.
"He told me that he had seen me on the playground when I was 15 the year before and thought I was pretty, so he wanted to get to know me better," JC told the court.
"I think he tried to take my class on purpose."
JC said that Mr. Dawson bought her a backpack and would put love letters in it.
"When I went to biology class, he would put notes of love and affection in my bag, and he knew where my classroom was," she said.
Crown prosecutor Craig Everson told the court that "Happy birthday XXX" was written on one of the notes that JC got on her 17th birthday.
Others say, "Valentine, I love you XXX forever" and "The happiest birthday with all my love, XXX."
Another way to say it: "Merry Christmas. Every minute, once or twice. Always love. God.”
"He wanted to hide who he was because it was 1980 and I was 16 and that's what he called himself," JC said when asked why Mr. Dawson signed the card as "God."
In 1981, when JC was in her last year of high school, she lived with the Dawsons for a while as a babysitter.
She told the court that when she was staying with the family in Bayview, Mr. Dawson would give Ms. Dawson alcoholic drinks so Lynette would fall asleep and they could have sex.
She was finally told off by Ms. Dawson, and she had to move into the home of Mr. Dawson's brother.
"Ms. Dawson said you've been mistreating my husband," JC told her.
"She figured out that there was more going on."
Mr. Dawson left his family at the end of December 1981 to move to Queensland with the student and "start a new life."
But four days later, they were back in Sydney, and he went back to live with his family. The next month, Lynette went missing.
Later, JC married Mr. Dawson, and the two of them moved back to Queensland in 1984. They were together until 1990, when they broke up.
Merilyn Simms, who is Ms. Dawson's sister-in-law, told the court earlier that she had last seen Ms. Dawson in the middle of 1981, but that they had talked on the phone in October of that year.
During the conversation, Ms. Simms said that Ms. Dawson said her husband was "very angry all the time" and that she was worried about how their relationship was getting worse.
Ms. Simms told the court, "She was very upset, and she said that Chris was always angry and evasive."
"She said that he wouldn't even talk to her."
She said that they were no longer having sexual relations, which she didn't understand because they had always been very regular and active.
She asked if there was anyone else, but he told her there wasn't. She was just really mad. She also told me that we couldn't talk to each other.
"She was very worried that Chris wanted to move JC into the family while she was doing her HSC because JC was having problems at home."
Patricia Dawson, Ms. Dawson's sister, has already told the court that Lynette told her around Christmas 1981 that Chris was "always angry with her."
In 1990, JC met Ms. Simms and her husband, Greg Simms, who is Ms. Dawson's brother, at Woy Woy on the Central Coast.
The meeting took place eight years after Ms. Dawson went missing and after JC and Mr. Dawson broke up.
The court heard that during the conversation, JC said that Mr. Dawson had tried to hire a hitman to kill Ms. Dawson but changed his mind.
The lawyer for Mr. Dawson said that the claim that he had tried to hire a hitman didn't have a "scintilla of truth."
Mr. Simms told the court that he thought Mr. Dawson had killed his sister. Mr. Dawson was the best man at Mr. Simms' wedding.
When asked if he thought Mr. Dawson was guilty, Mr. Simms replied, "I think so."
Pauline David, Mr. Dawson's lawyer, asked if JC's claims and his participation in The Teacher's Pet podcast had changed his point of view.
But he told the court that meeting JC in 1990 had only "slightly" changed his mind.
Ms. David asked, "It is true, though, that you came to court to shape your evidence in a way that would prove your theory that Mr. Dawson killed your sister."
"My honor is very important to me, and what you say is wrong," Mr. Simms said in response.
The trial goes on.