Did Ohio anesthesiologist gas his wife to death?
As Dr. Mark Wangler's freedom hangs in the balance, he and his wife, Esther, find strength in their faith.
"If the Lord calls me to serve him in prison, you know, as an inmate, that's what it's gonna have to be," says Mark.
"You know, we just have to be prepared for whatever happens and to accept whatever happens," adds Esther.
"This is the day of days for you, do you have some optimism?" Peter Van Sant asks Mark on the steps of the courthouse
"Yeah, the way the evidence is, it's just absolutely overwhelming so yeah, I've got a great deal of optimism," he says.
Final arguments begin with Prosecutor Jana Emerick zeroing in on Mark's suspicious behavior the morning Kathy died.
"The problem with lying is that it's the little details that catch up to you - that trip you up," she tells the court. "The defendant started to head into his own house because he wanted to take a shower. Now, if you really thought that a faulty hot water heater had just killed someone in that potentially unsafe home, the last thing you're going to do is go in there and take a shower."
Emerick dissects Mark's 911 call, saying it, too, points to his guilt:
"...consider the defendant's tone of voice and demeanor," she continues. "Does it sound a little staged, a little phony to you? Red flag."
911 Operator: Is she breathing?
Mark Wangler: No, I think she's not breathing!
But defense attorney Chris McDowell has a different take on that 911 call.
"When you listen to the tape, you can hear the panic in his voice," he says.
And he insists the prosecution never offered a clear explanation of how Dr. Wangler might have murdered his wife with carbon monoxide.
"It's their theory that it came from an internal combustion engine. If that's the case, there would be the strong smell associated with that gas. The gas and the vehicle exhaust fumes are intertwined. If you have one, you have the other," McDowell tells jurors. "The lack of the exhaust smell is strong evidence of accident."
"He thought he had a perfect crime," says Sara.
As the case goes to the jury, Kathy's mother and siblings wait and pray for a verdict of guilty.
"We're gonna put it in the hands of God... there will be justice with Kathy's death," Sara tells Van Sant.
"What is this wait like for you?"
"Terrible. No words can describe it."
But Kathy's son, Aaron, is praying for an acquittal.
"What if the verdict goes against your father?" Van Sant asks.
"I'll be devastated," Aaron replies. "I've already lost one parent. And to lose another would be - it'd be a lot."
On the second day of deliberations, "48 Hours" is with Mark Wangler at his home when he receives the call that the jury has reached a verdict.
"What are you thinking?" Van Sant asks Mark.
"[I'm] just praying that, you know, for an acquittal. That's all I can say, Peter."
In the courtroom, Kathy's mother and siblings gather on one side; her two sons on the other.
The verdict: Guilty of aggravated murder.
There are tears of relief and tears of sorrow. Mark Wangler appears stunned.
Then, Judge Richard Warren has some scathing words as he sentences him to life in prison.
"You violated the Ten Commandments: Thou shalt not kill," Judge Warren says. "You also violated the Hippocratic Oath. As a doctor, which is the first thing: You shall do no harm."
This courtroom drama isn't over. Kathy's mother is about to have the last word.
"We know you have always been a very selfish person who really did not care about our beautiful daughter, only yourself," Sara Schlarman says.
It's a moment she's been waiting for for almost five years.
"Mark, you senselessly robbed Kathy of her many most precious moments; her two sons, Nathan and Aaron. She worshipped them, did everything in the world for them."
Then, the man once revered for saving lives is led away to prison... for taking one.
"Justice has been served," Sara whispers in court.
Esther Wangler vows to keep fighting to free her husband.
"He is innocent of these charges. He will be out on appeal," she tells reporters following the verdict. "We will stop at nothing to get him out on appeal. This is a cruel, cruel, biased investigation."
But it's clear this fight has taken its toll, as Esther retreats to her home, comforted by her son.
"It's just gonna be shock for a long time, just figuring out what to do day by day," she says.
For now, the case is closed. But for Detective Clyde Breitigan, there is no celebrating - only thoughts of a family destroyed.
"I feel sorry for everybody involved in this," he says. "Kathy's gone. Her family lost Kathy. The two boys, Aaron and Nathan, lost their mother. Nobody won in this case. Nobody won. It's just sad."
"She loved life ... was always happy, loved family," Joanne says. "I miss that laugh."
Mark Wangler will be eligible for parole in 25 years; He will be 80 years old. Wangler is appealing his conviction.
Kathy's $600,000 life insurance policy was split between her two sons.
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