Inna Makarenko, 44, Yevhen Makarenko, 43, and two of their adult sons, Oleh and Vladyslav, stormed the gay man's apartment in August, savagely beating him and leaving him to die on the blood-covered floor for 13 hours.
Protosenya was Deputy Chairman of Russia's natural gas company Novatek. His death comes days after another Russian businessman was found dead with his family in their Moscow apartment.
The 44-year-old who was arrested by the NYPD has been charged with murder, criminal tampering and criminal possession of a weapon over the brutal weekend stabbing.
According to the sources, when Bonola finished allegedly spilling his guts to authorities, he ate a bagel with cream cheese while his statements were being processed.