Suresh was found dead, hanged with a saree from the window of a lock-up in the Bukit Sentosa police station, Serendah, on Friday about 2pm.
He had been picked up by a patrol car and taken to the station about 11.30am after he was confronted by two policemen on motorcycles near his Taman Teratai home.
His mother, Liew Kiew, 47, said police informed them that a post-mortem at Kuala Kubu Baru Hospital showed he had committed suicide.
She was told of her eldest son’s death by police about eight hours later, at midnight. When their questions went unanswered, the family lodged a report at the Hulu Selangor police headquarters on Saturday.
Siva Subramaniam and Suresh’s father, R. Kunasekaran, 47, a dispatch rider, visited the lock-up where Suresh was found hanged.
Siva said: " I want the police to answer several questions.
"How did the saree get into the lock-up? Assuming that the deceased managed to bring the saree into the lock-up, what were the police doing? Aren’t they supposed to monitor detainees? Secondly, what could have pushed the deceased to commit suicide only a few hours after being detained?
"Thirdly, why the delay in informing the family of his death?"