Polish model and girlfriend of Jerome Boateng, Kasia Lenhardt committed suicide on her son’s sixth birthday just a week after she broke up her relationship with the German footballer.

Kasia Lenhardt, 25, was found dead at a luxury apartment thought to belong to Boateng in Berlin’s upmarket Charlottenborg neighbourhood on Tuesday night by police, and the death is not being treated as suspicious.

A friend of Kasia’s told MailOnline that Tuesday was son Noah’s sixth birthday and that she was home alone when she died. Noah is Kasia’s only child, born when she was aged 19 and in a previous relationship with a man whose name has not been made public.

Boateng has three children, all from previous relationships, including nine-year-old twin daughters Soley and Lamia with ex-fiancee Sherin Senler and a five-year-old son, Jermar, by an unknown woman.

Kasia’s 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 on Wednesday by model friend Sara Kulka who paid tribute in a cryptic Instagram post that said, “I hope the truth comes out. I know how much you wished it would.”

Polish-born Kasia – real name Katarzyna – had been dating 32-year-old Boateng for 15 months before their relationship fell apart on February 2, sparking a vicious fight that saw the couple exchange blows via social media and the press.

Boateng had accused Kasia of sabotaging his relationship with ex-girlfriend Rebecca and his family before they started dating, and of blackmailing him into staying with her.

Meanwhile, Kasia, who had the footballer’s name tattooed on her ribcage, branded her ex ‘the devil’ and vowed to ‘speak up’ and ‘fight back’ once she had recovered from the break-up.

Just hours before she was found dead, Kasia had posted to Instagram talking about a ‘new chapter’ in her life.

The model’s heart-broken parents also told of their sadness at their daughter’s sudden death Wednesday.

In a statement, they said, “It is with great dismay and sadness that we must confirm the unexpected death of our daughter Kasia on February 9th, 2021.

“We thank you for the overwhelming sympathy, but at the same time ask you to refrain from expressions of grief so that we can find ourselves in these difficult hours.”

She was also mourned by model Lovelyn Enebechi, who had starred on TV show Germany’s Next Top Model where Kasia also rose to fame.

“Rest in peace! You wonderful, great person, I miss you and I am incredibly sad,’ she wrote on Instagram.

“I would have loved to say goodbye to you and can not put into words how much I miss you, I will never forget you! I wish your family a lot of strength.

Boateng, who now plays for Bayern Munich, was the first to announce the split after Kasia wrote off his Mini in a crash in Berlin on January 5, with German media reporting that she was over the alcohol limit.

The sportsman said he was going to ‘take responsibility and act in the interests of [my] family’ while apologising ‘to everyone I’ve hurt especially with my ex-girlfriend and our children’.

In an interview with German newspaper Bild, Boateng then accused Kasia of blackmailing him with fake accusations of domestic abuse, while saying she has a ‘massive’ problem with alcohol.

He admitted cheating on ex Rebecca Silvera with Kasia, but said she was also controlling and abusive.

But Kasia hit back, saying she had in fact ended the relationship because of Boateng’s ‘lies and constant infidelity’.

News of Kasia’s death was confirmed by fellow model Sara Kulka, who uploaded a photo of the pair on Instagram.

At the time of Kasia’s death Boateng was in Qatar playing for Bayern in the Fifa Club World cup. The team won the semi-final on Monday night 2-0 against Egyptian side Al Ahly SC, and are due to play in the final tomorrow.

But Boateng will not be available after he requested to return to Munich, with coach Hansi Flick saying he will not be playing ‘until further notice’.

She leaves behind a son, Noah, who is thought to be five years old and was born to a previous partner that she split from three years ago.