Alessandro Macchi, managing director of Italian extrusion equipment maker Macchi SpA, was shot dead Nov. 2. His body was found in his house in Rapallo.
His longtime companion, Johanna Malgorzata Lohninger, 59, was found in the house in a coma, apparently self-induced using barbiturates, authorities said.
Police arrested Lohninger on suspicion of murder and said they had recovered the pistol used in the shooting. Local media reported Macchi was shot six times.
Macchi and Lohninger's 20-year-old son Luca was not with the couple at the time, police said.
Alessandro Macchi, 46, was described as the driving force of the company, based in Venegono Inferiore, Italy.
In a statement issued Nov. 3, the company said it will continue the course set by Macchi for growth and development.
``The passion and dedication for his job are all elements that made Sandro a successful manager and a reliable and trusted business partner,'' the statement said.
Macchi SpA is one of Italy's most successful suppliers of blown film lines, as well as equipment for cast film. It recently began planning to expand its production facilities.
It employs around 100 people and has annual sales of about 55 million euros ($70 million).
Macchi was the son of Luigi Macchi, who founded and is still active in the company.