Dinesh killed the bed-ridden Ram Lal Bhutani and his wife Kaushal on the night of September 1 and fled with valuables, they added. For Kaushal, it was a cruel twist of fate, as she was killed just a day before her birthday.
The next day the couple's house was found locked from outside by another attendant, Dulal Sarkar, who was on morning duty, after which the police were called in.
Kaushal's body was found with head injuries, suspected to have been inflicted with a hammer, while Ram Lal had been smothered with a pillow and then strangulated, said a senior police officer.
After investigations, the police traced him to Ara in Bihar and nabbed him yesterday.
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The accused told police that he had panicked and killed Ram Lal after the man woke up and caught him stealing. When his wife woke up due to the noises, Dinesh killed her too.
The accused had stolen gold jewellery, including rings, chains, wrist watches, silver coins, the couple's cell phones, Rs 6,500 in cash and some jars of dry fruits, said the officer.