Swedish DJ Avicii had a secret girlfriend and was a doting step-father to her young son at the time of his death.
Model Tereza Kačerová posted a heartbreaking open letter on her Instagram, in which she revealed that the pair had been planning on having children of their own.
She also posted a video of photographs from their time together, showing Avicii's close relationship with her son Lucas.
Avicii, whose real name was Tim Bergling, was found dead in the city of Muscat, Oman, on Friday last week.
'Dear Tim, ' Ms Kačerová writes in the letter to the late 28-year-old. 'I've spent the last days waiting to wake up, waiting for someone to tell me this is some sick joke, some awful mistake. I think it's finally settling on me now that I will truly never get to see you again'.
In her letter, she reminisces of their time together and speaks of their plans for their future.
'I used to tell you that Luka will never remember a life without you. Now I hope that he will remember his life WITH you. I'll be there to remind him. I'll show him
'Every time I think about something we won'd finish I feel physical pain in my heart.
'We never finished the Harry Potter marathon - we had the last one left - you never witnessed me having a meltdown when Snape dies.
'I never finished persuading you that our daughter's name MUST be Serafina.
'You never finished your tattoo sleeve in which the inner forearm would have a face coincidentally resembling mine.'