Not getting justice even after three years, Alka and her husband Sunil consumed poison outside the police inspector-general's house in May 2009.
Alka died within two hours after consuming poison but Sunil survived in the hospital.
However, after getting a complaint from Alka's parents, police arrested Sunil for provoking his wife to commit suicide.
Police officials said that they have arrested Jatinder, the main accused in the rape case from Panipat district.
Sunil's family members have been complaining against police action against him. They accused the police arrested Sunil just to hide their inaction to nab the rapists.
'They had forcibly picked Himanshu and Nitika and did not inform us about their whereabouts. We are feeling very insecure. We don't know where the children are,' said Sheela, Sunil's sister.
'By sending the kids to Bal Gram, we have done nothing illegal. We have adhered to the norms of the Juvenile Justice Act,' a police official said.
Meanwhile, Sunil was produced in a local court here Thursday and his judicial remand was extended till Sep 3.