BANGALORE: Obsessed with Saurabh Rastogi 's wife Ankisha, their colleague Rishwin Chengappa allegedly stabbed the MNC manager to death last Sunday.

Rishwin, 25, a senior associate at Saurabh's firm, was arrested for the murder. Police said Rishwin stabbed Rastogi six times on his neck and twice in his belly, in his Sun City flat in HSR Layout.

An infatuated Rishwin thought that killing Saurabh would clear the path for him to marry Ankisha. He planned the murder after he heard that Saurabh and Ankisha were planning to move to the US. Fear of losing her drove him to the desperate deed and he executed his plan when Ankisha was away in Pune.

Police cracked the case by tracking mobile phone signals. All circumstantial evidence, including the fact that there were no sign of a forced entry, suggested that someone known to Saurabh had murdered him. They collected call data on Saurabh's and Ankisha's mobile phones and checked out the numbers.

Soon, police found that Rishwin's mobile signals were active that night. When police went to Saurabh's workplace for a background check on Rishwin, they learnt he was infatuated with Ankisha and picked him up for questioning. Rishwin cracked under intense interrogation and confessed to the crime.

Saurabh, Ankisha and Rishwin were colleagues at the same MNC firm. Police sources quoted Rishwin as telling his interrogators that he had even confessed his feelings to Ankisha, who, however, turned him down.

As the infatuation acquired maniacal tones, he plotted the murder. He went to Saurabh's house on Saturday around 8.30pm, armed with a knife. On entering the house, he overpowered him and stabbed him multiple times, investigators said.

