The man, a resident of Telugupalayam in the city, had bought a bottle of soft drink last night and mixed it with cyanide before offering it to his sons and consuming it himself, when his wife was away at work, police said.
The children cried loudly after noticing their father vomiting, following which the neighbours rushed to the house and took the three to Government Hospital, they said.
While, the man died, the children are undergoing treatment in the hospital, where their condition is said to be stable, they said.
A suicide note has also been recovered from the house.
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