Husband Who Killed Wife, Six Children and Himself Had Affair With Intern

A Michigan father accused of killing his wife and six children before dying by suicide inside their fire-damaged home had previously been involved with a younger office intern, a betrayal his wife said shattered what once felt like a picture-perfect family life.

Kristopher Karolkiewicz, 47, his wife, Amanda “Mandy” Karolkiewicz, 39, and their six children, who ranged in age from five to 15, were discovered dead Friday morning at the family’s $750,000 home in Grand Haven Township, Michigan.

Investigators said Kristopher fatally shot Amanda and the children, set multiple fires inside the residence, and then turned the gun on himself.

Nearly eight years before the tragedy, Amanda had written on Reddit about what she described as Kristopher’s “emotional affair” with a “much younger” intern at his workplace.

In posts shared two years ago, Amanda painted life in the Lake Michigan beach town of Grand Haven as something that once resembled “living in a Hallmark Movie,” while also explaining that she first met Kristopher when she was an intern herself.

“He was divorced and older than me … fast forward ten years and five kids, he was cheating with the intern again — the same age I was when I was the intern,” she wrote.

Amanda said the fallout left her consumed by pain and self-blame. “After about a year of self-loathing, I remember crying and looking at myself in the mirror and realizing how f***** up it was that I was the one who was living so miserably because of what he did,” she wrote. “I finally realized that I had been the only person who has ever showed up for myself my whole entire life.”

Although she had considered ending the marriage, Amanda said the thought of leaving Kristopher felt “insanely terrifying.” She wrote that she ultimately chose to keep trying to repair the relationship, largely because of their six children.

‘I kept telling myself, “I love my kids more than I hate my husband right now.” They have no idea — I faked it ’till we made it,’ she wrote in the 2024 post. ‘We’re in a much better place 4.5 years out, but it’s still a fight to stay in a healthy place.’

Kristopher claimed his affair never turned physical, but Amanda said she ‘never quite believed him.’

She said the ‘evidence [made] it all seem like it would be very unlikely that they were never physical.’

She admitted on the forum that she once shoved her husband after learning of his affair, a remark suggesting that the issues in their marriage stemmed beyond his infidelity. 

‘I don’t feel bad still,’ Amanda wrote of the incident. ‘He towers over me and destroyed me mentally. It felt like I was being assaulted and needed to fight back. I think it’s a fight or flight thing.’

The couple started attending individual therapy and marriage counseling, which Amanda said would often infuriate Kristopher.

‘He was having trouble sleeping and was so angry and mad at himself because the counselor asked him if he heard me. It seems like such a big reaction to that pretty normal question from a marriage counselor. He is so sensitive to correction that I’m feeling so discouraged that we’ll ever be able to make progress,’ she wrote.

Throughout their years of therapy, the couple seemingly made positive strides in their marriage.

Amanda said they both adapted a lifestyle of sobriety and that although they still had their struggles, she was ‘happy’ with her life. 

‘For me, “safety” is the ability to trust that (he) will not get angry or defensive when I’m triggered, and will help to carry me through it,’ she wrote. 

‘We’re almost five years out, and he’s trying, but still struggles with defensiveness. But in general, am I happy? Yes. I wouldn’t say I feel safety in my emotions, because he still struggles with receiving my triggers without defensiveness, and that’s slowing down my ability to regain feelings of safety.’

Amanda and her children’s deaths have been ruled a homicide, and Kristopher’s has been ruled a suicide, the Ottawa County Sheriff’s Office said.

Police believe that Kristopher shot and killed his wife and their six children before starting several fires throughout the home. 

It remains unclear how the blazes began, and Michigan State Police arson investigators are looking into the case. 

Four of the six children were Kristopher’s biological children. The other two were adopted by the couple. 

None of the children has been named, but four of them were boys, aged 15, 12, 11, and five. Their daughters were 11 years old, police said. 

The family’s pets also died after inhaling smoke from the fires. It is unclear how many there were. 

Amanda and Kristopher were wed in 2009. 

Their youngest child was about to begin kindergarten at Peach Plains Elementary, where Amanda was a teacher.

The oldest, 15, was heading into high school and had recently begun driver’s education. 

Amanda was a stay-at-home mom in 2024, her Reddit post revealed. She recently returned to the workforce and was serving as a substitute teacher for Grand Haven Area Public Schools.

Last Friday, the district offered support to the community.

‘It is with deep sadness that we acknowledge reports of a devastating incident in Grand Haven Township earlier today involving the loss of multiple lives, including several school-aged children,’ Superintendent Kristin Perkowski wrote.

‘Regardless of the details that may emerge, this is a devastating incident and a tragic loss for our community.

‘Our hearts are with all those impacted, and we know many throughout our community may be grieving and struggling to process this news.’

Amanda was also honored by the district in a social media post in January. 

Kristopher, however, was recently unemployed after his ’employment ended’ at the American Heart Association earlier this month, WDIV reported.

He had been the organization’s national vice president of sales and marketing since September 2023 and predominantly worked from home in a remote capacity.

‘As an organization with professional staff who are dedicated to helping others, we are devastated by the news out of Grand Haven, and our thoughts are with the loved ones of those who lost their lives in this tragedy,’ the American Heart Association said in a statement to the news outlet.

Kristopher’s affair occurred before he started working for the nonprofit.