25-year-old Virendra Dixit, who was picked under the Arms Act yesterday, was found hanging inside the police lockup at Hasanganj Police Station late last night, they said.
Virendra was rushed to trauma centre where doctors declared him brought dead, sources said.
While police claimed that Virendra tore the blanket and used it to hang himself with the ventilator, his family members suspected foul play.
Senior Superintendent of Police J Ravindra Goud has suspended six policemen, including inspector Hasanganj, Javed Khan, sub-inspectors Shivakant Tripathi, Brijesh Mishra and three constables Rakesh Kumar, Ram Kripal Pandey and Muneshwar, they said.