An engineering student, who suspected his girlfriend of having an affair, rode her to death and killed himself in the process when he rammed his speeding bike into a bus, police said today.

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The incident took place last night at Nallapadu where the bodies of M Saidu Babu (23) and Krishna Jaa (22) were found.

Bodies of the two engineering students, who died on the spot, were charred, police said.

A letter recovered from Saidu's shirt revealed his plan to kill his classmate and lover Krishna, whose fidelity he doubted, police said.

Their bodies have been sent for post-mortem examination and further investigations are on.