The Additional District Sessions judge D K Garg charged Shanker, Sunil, Ashok, Ravi, Jasod and Pradeep under the Gangster Act today for their involvement in the murder.
Revati Singh (75), was murdered at her residence and Rs 78 lakh in cash and ornaments were looted from their house on July 30, 2010.
Police had later arrested seven persons, including the domestic help Shankar, and recovered a cash amount of 52.80 lakh looted by them.