Dalla Chiesa was also investigating the death of Mauro De Mauro, a journalist who had himself been investigating the murder of Enrico Mattei, head of Agip, the Italian oil company.
Dalla Chiesa mimo jiné vyšetřoval smrt Mauro de Maura, novináře zabývajícího se vyšetřováním smrti Enrico Matteiho, generálního manažera italské ropné společnosti Agip.