"He wasn't doing it for enjoyment", she continued.
"I hate that", Tague said, choking up.
"Given what your son has admitted, your son is the definition of what's known as a serial killer", Begnaud pointed out.
Even in the midst of the final days of the election, Zirinsky knew this shocking case of a potential serial killer was a story worthy of long-running CBS News Saturday night newsmagazine.
"She's numb, very numb", Gaehring says.
Tague reveals what went through her son's mind when he held Kala Brown captive for two months after fatally shooting her boyfriend.
Kohlhepp acknowledged the grisly cold case after authorities granted him several requests, including letting him speak to his mother. "I know that's what they say... he was a very misunderstood". "He was doing it because he was mad and he was hurt".
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Todd Kohlhepp is believed to have comitted at least seven murders.
When Bickart was asked if there were any indications that he would kill anyone, he said, "I was concerned about his relationship with females, the fact that he would go out and kill other people was not on the agenda". Brown told the police she had been a hostage for two months on Kohlhepp' s 95-acre farm just outside Spartanburg.
However, the widow of the shop owner who was killed by Kohlhepp, said she was told the incident played out very differently.
So, CBS dispatched David Begnaud and 48 Hours correspondent Peter Van Sant to SC to interview local investigators, family members, neighbors, friends of Kohlhepp and friends of the victims. Charlie Carver, 32, was found dead last week in a shallow grave at a rural property after disappearing with his girlfriend, Kala Brown, in August. She told "48 Hours" that her son "is not a monster".
Tom Lucas, the father of slain service manager Brian Lucas, said he's heard differently.
Tague told CBS that there are no more victims to be discovered, and the 45-year-old registered sex offender and real-estate agent is expected to plead guilty to seven murders and kidnapping. He was convicted and sentenced to 14 years in prison, being released in 2001.
His mother asked for leniency, according to court records obtained by WHNS-TV in SC. Spartanburg County Sheriff Chuck Wright has said Brown is "alive and well". According to psychiatric records made public in his trial as a teenager, Kohlhepp displayed anger and aggression since childhood toward animals and other children. Those interviewed by authorities at the time said the disturbing behavior included trapping a child in a dog cage, killing a goldfish with Clorox and shooting a dog with a BB gun.