Babu Ram Yadav (48), who worked as a section officer at the DJB office in west Delhi's Paschim Vihar, was killed on August 2.
Police yesterday arrested Amit Rathi (24), who is an employee of Yadav's son. He led policemen to his accomplice Rahul Bhatia (24).
The police said they scanned CCTV footages, in which the accused were seen entering Yadav's son's office while he was present there.
They could be seen fleeing with two bags containing cash in a Maruti Breeza car, the police said.
Jagdeep and Bhatia conducted a recce for over a week, he added.
The police have recovered a bag containing bank documents that were robbed.
Jagdeep is on the run and a search has been launched to nab him, the officer said.
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