Police said trader Ramesh Gupta's body was found near railway tracks at Surajkund overbridge, while those of his wife Sarita (45), daughter Payal (15) and son Ayush (10) were found at his home Sahebganj area under Rajghat police station area of the district.
The trader's elder daughter Rachna (20) too was found unconscious in the house and was rushed to BRD Medical College here, where she died during the treatment a few hours later, police said.
The bodies have been sent for post-mortem examination, said police, adding the matter is being probed.
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