Félicité Tomlinson, a social media influencer and sister of pop star Louis Tomlinson , has died age 18.According to The Sun , Tomlinson collapsed at her home in Earl’s Court, London on Wednesday 13 March after suffering a suspected heart attack . A Metropolitan Police spokesperson said: ”Police were called by London Ambulance Service at 12.52pm on Wednesday, 13 March to a residential address ... following reports of a female in cardiac arrest.From extras.“A female believed to be aged 18 was pronounced dead at the scene. A post-mortem examination will take place in due course.”The London Ambulance Service said: “We were called at 12.51pm. We sent two ambulance crews, a single responder in a car and an advanced paramedic to the scene. Sadly, despite efforts of our medics, a person died.”The death of Félicité — known as Fizzy — is being treated as “unexplained” at this stage.The news comes after Tomlinson’s mother died of leukaemia in 2016. Earlier this month, he released his new single “Two of Us” which he said helped him deal with his grief at her passing .