Flack was found dead on Saturday after taking her own life as she awaited trial for allegedly assaulting her boyfriend Lewis Burton, 27.
The force’s directorate of professional standards (DPS) reviewed all previous police contact with the Love Island presenter, before making a mandatory referral on Wednesday, Scotland Yard said in a statement.
It is standard practice to do so when a member of the public dies or is seriously injured and has had recent contact with police, the force said.
No conduct issues have been identified by the DPS and no officer has been served a notice of investigation, according to the statement, which added: “No officer is on restricted duties or suspended.”
The watchdog – the Independent Office for Police Conduct (IOPC) – said it would make a decision on its level of involvement after careful assessment of the information sent in the referral.
“Receipt of a referral does not mean an investigation will necessarily follow,” an IOPC spokesperson added.