Raj Kumar of Mahindra Colony is suspected to have committed suicide. His son, an engineering graduate, was booked in a case of kidnapping.The police found his bike from near Bhakra Canal in Passiana this afternoon. Suspecting that he may have jumped into the canal, the police have deputed a team of divers to locate him.An undated letter addressed to a DIG had been recovered from the site, alleging that he had been duped by a firm owned by the kidnapped girl’s family, sources said.Raj Kumar’s son Deepak Kumar was arrested for masterminding the kidnapping of Shanvi Gupta. Raj Kumar was under stress and had reportedly tried to reach out to the victim’s family to get reprieve for his son, they said.Gurmeet Chauhan, SSP, that he had deputed two senior officers to probe the case. “While a team is trying to locate Raj Kumar from the canal with the help of divers, another is trying to ascertain if it was a mere drama,” he said.”Things will be clearer by tomorrow,” he said, claiming that the kidnapping case had nothing to do with Raj Kumar’s disappearance.The district police earlier arrested Raj Kumar’s son and his jeweller friend for kidnapping eight-year-old Shanvi Gupta.The girl was released by the kidnappers about six hours after the incident on May 4. The investigators zeroed in on the duo after scrutinising the call details of the mobile phone used to make ransom calls.