A 28-year-old man was found dead by his father at his home in Żnuber Street, Santa Luċija yesterday morning.
The father alerted the police and a medical team from Mater Dei hospital certified the man dead, the police said.
Police sources said the man was suspected to have died of a drug overdose, although an autopsy is expected to be held today.
Magistrate Audrey Demicoli appointed a team of experts to help her in an inquiry.