Michigan father killed wife and six children before bodies were found in burned home in ‘unspeakable tragedy’

Kristopher and Amanda Karolkiewicz and their children, ages 5 to 15, were found Friday after authorities responded to a fire at their home in Grand Haven Township

Amanda Karolkiewicz's brother Allston Lawwill, 28, died from an accidental fentanyl overdose six years before she, her husband Kristopher, and their six children were found dead in Michigan.