Midwest husband who killed wife, six kids and himself after setting home on fire cheated with much younger INTERN in affair that destroyed family's 'Hallmark movie' life

By NATASHA ANDERSON, US SENIOR NEWS REPORTER Published: 14:01, 28 July 2026 | Updated: 14:20, 28 July 2026 A Michigan father who murdered his wife and six children before killing himself in their burning home cheated with a young intern in an affair that destroyed the family's 'Hallmark movie' life. Kristopher Karolkiewicz, 47, his wife, Amanda 'Mandy' Karolkiewicz, 39, and their six children, ages five to 15, were found dead at their $750,000 home in Grand Haven Township on Friday morning.  Police determined that Kristopher shot Amanda and their children before starting several fires throughout the home and shooting himself. But about eight years before the deadly attack, Kristopher had an 'emotional affair' with a 'much younger' intern at his office, according to a series of posts Amanda shared on Reddit two years ago. Amanda, describing her life in the beach town of Grand Haven as 'like living in a Hallmark Movie,' revealed how she met Kristopher when she herself was an intern. '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.  '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. I finally realized that I had been the only person who has ever showed up for myself my whole entire life.' She wanted to end her marriage but the idea of leaving Kristopher was 'insanely terrifying,' she said, adding that she decided to try and work through the problems in the marriage for the sake 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 Karolkiewicz, 47, his wife, Amanda 'Mandy' Karolkiewicz, 39, and their six children, ages five to 15, were found dead at their home in Grand Haven Township on Friday morning Kristopher shot Amanda and their children before starting several fires throughout the home and shooting himself. Above, the family with Amanda's parents Steve and Becky Lawwill 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.  Amanda, then a stay-at-home mom, described her life in the beach town of Grand Haven as 'like living in a Hallmark Movie' in a Reddit post two years ago But around the same time, she also detailed the struggles of her marriage, including the longlasting impacts of an emotional affair that Kristopher had with an intern at his job '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. His affair happened about eight years before the deadly attack, according to the Reddit posts  Four of the couple's six children were biological. The other two, both girls, were adopted 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.  It remains unclear how the blazes began, and Michigan State Police arson investigators are looking into the case. The family's pets also died after inhaling smoke from the fires 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.