Police inspector M H Nerlekar of the MFC police station in Kalyan said that the victim, Haji Abdul Gaffar Shaikh, was done to death brutally on Friday night by a group of six people who had been absconding since then.
The police nabbed all the six, with the sixth arrest conducted today, the police officer said.
The police said that previous enmity between the victim and one of the accused, who both lived in the Kala Talao area, lead to the murder of the middle-aged man.
When asked, the police officer denied that the attempt to rape a girl by one of the accused, which was objected to by the victim, was the immediate provocation for the killing.
The police have named those arrested as Shamsuddin alias Buddha Mohidin Sheikh, Sadiq Adar Sheikh, Zamir Kadir Sheikh, Sameer Sayyed Sheikh, Subhash Malbari and Sumit Prajapati.
All the accused have been charged under relevant sections of IPC, Arms Act and Bombay Police Act.