Brad King convicted of murdering presenter Diane King

Popular and beloved Michigan TV news anchor Diane King was just days away from giving birth to a baby girl on October 30, 1990, and went to her mailbox to find a disturbing letter. Cut-out magazine letters read: “You should have gone to lunch with me.”

“And what's even more frightening is that it wasn't sent, it was placed,” said Lowell Cauffiel, author of eye of the beholderTo Killer relationship with Faith Jenkinsairs Saturdays at 8/7c on Oxygen.

The letter not only shocked the 34-year-old, but also those around her.

“Who cuts out letters and sticks them on a piece of paper?” continued Cindy Biggs, Diane’s friend Killer relationship with Faith Jenkins. “It was so scary. I was very worried about her, especially because she was about to give birth to a baby girl.”

A little over three months later, on February 9, 1991, Diane was shot in her driveway in Marshall, Michigan as she got out of her car with her three-year-old son and three-month-old daughter inside. Her son said it was his earliest memory.

“I remember my mother getting out of the vehicle and then [gunshots]Marler King continued Killer relationship with Faith Jenkins. “You know, in one case it's there, in the next it's not. I think I screamed more than anything and then it ended up waking my sister up.”

But was it her stalker or someone much closer to her who pulled the trigger? The police investigation uncovered many secrets between Diane King and her husband Bradford.

Diane King was afraid of a stalker in her final days

Diane King and her husband Bradford married in July 1984.

“Diane explained to me that there was an instant connection between her and Brad when they met,” Biggs said.

The couple had their first child, Marler, in 1988, and in 1989, Diane was hired as a morning news anchor at a television station in Battle Creek, Michigan, while her husband taught part-time at Western Michigan University. They soon moved to a historic farmhouse on 500 acres in Marshall.

But as the birth of her second child approached in 1990, Diane received not only threatening letters but also other forms of harassment. In the spring of that year, she received a call from a man at the news station, one of many in the coming months.

“He asks her to have lunch with him and she politely declines,” Cauffiel said. “It gets to the point where he calls three times a week.”

Diane also received a letter at the train station from a man who was in love with her. Then, in December 1990, as she went to visit her family, Brad called her and said someone had tried to break into her house.

“It raised a red flag. And we were concerned about that,” said Jim Stadtfeld, a detective with the Calhoun County Sheriff’s Department Killer relationship with Faith Jenkins.

The family increased lighting and security around their home, but Diane was still living in fear during the third trimester.

“After the break-in occurred, their alert level was out of the norm,” Biggs said. “That really, really shocked her.”

On February 9, 1991, Bradford King told police he was out for a walk on his property when he returned and found his wife, who had been shot twice, near the family car and called police. Police discovered that a door to a nearby barn was open and a bullet casing was lying in the hay.

“I believe the shooting was targeted,” said Sgt. Harold Badger with the Calhoun County Sheriff's Department Killer relationship with Faith Jenkins. “It was being set up and the shooter was lying in wait.”

Police discover that Brad King was having affairs with his students

Officers got a clue in the murder when a Western Michigan University student called them and told them that Brad King was having sexual relationships with several of his students.

“We contacted several of these young ladies,” Stadtfeld said. “They all confirmed the fact that Brad told everyone that he and his wife were separated. This is another indication that he is very deceptive.”

Diane King also suspected that her husband was having an affair and told friends that the two were in marriage counseling.

“He told these women a whole series of lies,” Cauffiel said. “It was very pathological behavior.”

There was another strain on the royal's marriage: Diane was considering a career change that would force Brad to work more than part-time.

RELATED: Charlotte man claims he killed girlfriend after argument over text message: 'Control'

“He didn’t want that,” said Cauffiel. “Not only because he would have to work full time, but he also loses the woman who gives him so much attention. He won't be Mr. Diane Newton King. He'll just be a schlub. They argued a lot. There was a lot of tension.”

Friends told police that Diane was considering divorcing Brad, which, in addition to the affairs, gave him a motive for wanting her dead.

“I don’t think he was in love with his wife and was looking for a way out,” Stadtfeld said. “And when she said, 'I'm going to quit my job,' she forced him to do it.”

“If she decided to divorce him, it would be difficult,” added K9 trainer and trainer Gary Lisle Killer relationship with Faith Jenkins. “He would have nothing. She would get everything.”

A family weapon links Brad King to the murder of his wife Diane

Police searched the King's estate looking for the weapon used to kill Diane. They found a rifle buried deep in the stream mud, along with bullet casings.

“Someone had stepped on the thing to drive it into the mud and pushed it in as far as they could,” Lisle said.

The gun was found on the same trail where K9 dogs were following a trail that Brad King likely walked on the night of the murder. Brad's family identified the gun as their family property and Brad's property.

“His mother very reluctantly said that Brad was the one who suffered the whole thing,” Stadtfeld said. “That was one of the decisive moments. It was circumstantial evidence, of course, but we had family members who said they believed it was the gun that Brad left behind.”

In a final twist, police believed that Diane's own husband had played a role in her terror in her final days in order to avoid himself being suspected of the planned murder.

“Police believed that Brad King had offered the threatening letters and staged the crime scene of the burglary, and he did this by making it credible that his wife, Diane, was being stalked and the stalker was the one who shot her,” said Lisle.

In November 1992, a jury found Bradford King guilty of murdering his wife Diane and he was sentenced to life in prison without the possibility of parole, leaving his two children without parents.

Watch brand new episodes of Killer relationship with Faith Jenkins Saturdays at 8/7c on Oxygen.