The 25-year-old Polish model was found dead at a luxury apartment thought to belong to Boateng in Berlin’s upmarket Charlottenborg neighbourhood on Tuesday night by police who say the death is not being treated as suspicious.
A Berlin police spokesman said: ‘Yesterday at around 8.30 p.m. there was a police operation in Charlottenburg on suspicion of suicide. A lifeless person was found in the home. There are no indications of third-party involvement.
The sad event occurred on her son’s sixth birthday and a week after the couple had only split last week.
After the news of Kasia’s death broke on Wednesday morning it was confirmed in the afternoon that Boateng would be returning to Germany.
German champions, Bayern are due to play Mexican club Tigres UANL in Thursday’s Club World Cup final but Boateng asked to leave the team for personal reasons.
‘We were all really taken with it,’ Bayern boss Hansi Flick told a virtual news conference on Wednesday.
‘Jerome was in my room and asked me to go home. From the club side, we also fulfilled his wish.
‘After the corona test, which he also needs to enter Germany, he will travel home and will not be available to us until further notice.’
‘Jerome came to me and asked me to return home. After a negative (COVID-19) test he will return home and not be available until further notice.’
Speaking about Lenhardt’s death, a friend told MailOnline: ‘Yesterday was her son Noah’s birthday. Kasia was at home on her own. A member of her family called the police because they could not get hold of her and they were worried.
‘She died a week after Jerome gave an interview in which he said their relationship was over. He said some really nasty things about Kasia. She was very upset by it.’
Her death was confirmed by fellow model Sara Kulka who wrote a tribute post on Instagram, cryptically saying: ‘I hope the truth comes out now, I know how much you wished it would’
Sharing a photo of both of them, Sara wrote: ‘Rest in peace. You wonderful person, I miss you and would have loved to say goodbye.
‘I hope you find your peace now and I hope the truth comes out now, I know how much you wished it would.
‘I will never forget you, I don’t know anyone who could laugh like you. I send a lot of strength to the family.’
Lenhardt had been dating 32-year-old Boateng for 15 months before their relationship crashed on February 2 amid bitter accusations of blackmail and infidelity.
German news outlet Bild exclusively revealed that Kasia had been involved in a car accident in the footballer’s Mini on January 5, resulting in the vehicle being a write-off.
After crashing into a street lamp, Kasia was taken to hospital where she was found to have 0.6 per thousand alcohol in her blood.
Shortly after the crash, Boateng publicly ended his relationship with Kasia on Instagram.
He wrote: “As is known from the media, I ended the relationship with Kasia Lenhardt.
“We will go our separate ways from now on. That is regrettable, but for my family and for me it is the only right one.
“I had to take this step and draw a line. I apologise to everyone I’ve hurt especially with my ex-girlfriend Rebecca and our children.
“I am disappointed in myself too. A man has to take responsibility and act in the interests of his family and I’m doing it now.
“I wish Kasia all the best. Jerome Boateng.”
Kasia responded by saying she had ended the relationship because of the World Cup winner’s “lies and constant infidelity”.
She also branded Boateng ‘the devil’ and vowed to ‘speak up’ and ‘fight back’ once she had recovered from the break-up.
‘I will definitely speak up, but I have to collect myself. Please give me time. I will fight back! Because I’ve never been so deceived, used, and lied to. Give me a moment,’ she wrote