text:  Kelvin Maddox's employer, Kevin Otto, was convicted of two counts of manslaughter and sentenced to two years in a Suffolk County jail in 2019. Since his release, he has started a new business, cleaning drains. His criminal case was unprecedented for Boston. Prosecutor Lynn Feigenbaum told NPR that she had to convince a grand jury and a judge that the fatal trench collapse was more than just an industrial accident. It was a crime.