After the outbreak of World War II and the Nazi-Soviet alliance established by the Molotov–Ribbentrop Pact he moved to Soviet-occupied zone of Poland.

Jaroszewicz's body, found in his upstairs study, had the belt that had been used to strangle him secured by an antique ice axe from his collection.

[2] Investigators believe that she had earlier managed to injure one of the killers during a struggle, since blood from her and an unknown individual were found in another room in the house.

It was initially reported that they only took what were presumed to have been documents from one safe and left behind valuable old coins and art, suggesting the thieves were not motivated by financial gain.

[2] However police records show the thieves actually stole two guns, 5,000 German marks, five gold coins and a ladies' watch.

The killings received significant media attention in Poland, due both to Jaroszewicz's past leadership and the brutality of the crime.

While initial theories suspected that the murders were politically motivated, in 2017 Warsaw police revealed the burglary had been committed by the 'Karate Gang' of Radom, a group of violent criminals active through the 1990s.