The police apprehended six suspects for in connection with the murder of a history-sheeter and the assault on the mother of one of his accomplices in Anna Nagar.

The victim was identified as Robert alias Chinna Robert, 28, of Annai Sathya Nagar. He had criminal cases for murder and attempt to murder. At 6.15 p.m. on Thursday, a gang of men who came on bikes attacked him with knives and fled the spot. Neighbours rushed Robert to the Government Kilpauk Hospital, where the doctors declared him brought dead. Afterwards, the gang went to the house of an accomplice of Robert and attacked his mother.

The Anna Nagar police registered a case and launched an investigation. Sources said that a couple of years ago, Robert’s associate Gokul was murdered by one Logu due to previous enmity. Police suspect that Logu is also behind the murder of Robert.

On Thursday, police apprehended Logu and five others. Investigation is on.