CHANDIGARH, Oct 5: Mystery shrouds the death of a 23-year-old man, employed as a lab assistant in a private laboratory, whose decomposed body was recoverd from his rented house in Sector 20, late last night.The police were informed after Sanjay Soni's neghbours got a foul smell emanating from his room. The door, which was locked from inside, was broken and the body found.According to a police officer, the body appeared to have been decaying for about three to four days. Though no suicide note was found, the police suspect suicide, it was added. Further investigations are on to establish the exact cause of death, police said.