Félicité was found by authorities on March 13 in her apartment, after she reportedly collapsed from a heart attack.
“Police are in the process of informing her next of kin,” police wrote in a statement. “At this stage, the death is being treated as unexplained. A post-mortem examination will take place in due course."
At the time, Louis' rep confirmed to Us Weekly that the cause of death was a heart attack.
Since her death, sisters Phoebe, Daisy and Lottie Tomlinson have all paid tribute.