A string of failures have been found after a serial killer who stabbed six people to death, including his wife and children, took his own life behind bars.
Damian Rzeszowski, killed his wife Izabela Rzeszowska, 30, and their two children Kinga, five, and Kacper, two as well as his father-in-law, his wife’s friend and her daughter in August 2011.
After the crime, Polish-born Rzeszowski stabbed himself in the chest and collapsed, later receiving life-saving surgery and was later jailed for 30 years for manslaughter.
