Businessman Gulshan Vasudeva, his wife and business partner received several injuries and died of shock and hemorrhage, according to the postmortem report released on Wednesday.
While his two children died of slit injuries, the report said.
Vasudeva (45), his wife Praveen and business partner Sanjana jumped to their death in the early hours of Tuesday from the eighth floor of their apartment block in Krishna Apra society in Indirapuram on the outskirts of Delhi.
Before jumping to death, Vasudeva had killed his son Hrithik (14), daughter Hrithika (18) by slitting their throats at around 3.30 am on Tuesday and also killed their pet rabbit, the police said.
Postmortem report has confirmed that the children died of slit injuries by a sharp weapon, Ghaziabad (City) Superintendent of Police Maneesh Mishra said.
On the other hand Vasudeva received five injuries and his wife Praveen four and both died due to shock and hemorrhage, the officer said.
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Vasudeva's partner Sanjana also sustained 4 wounds and breathe her last in a hospital due to hemorrhage, the officer said quoting the autopsy report which police received on Wednesday evening.
The bodies of the businessman's family have been handed over to his kin.
On the other hand Sanjana's body was given to her brothers Firoz and Shameem for the last rites, the officer added.