Jerome Boateng's ex-girlfriend Kasia Lenhardt found dead aged 25

Germany's defender Jerome Boateng poses for a photo with his child and the World Cup trophy after winning the 2014 FIFA World Cup final football match between Germany and Argentina 1-0 following extra-time at the Maracana Stadium in Rio de Janeiro, Brazil, on July 13, 2014. [AFP PHOTO / FABRICE COFFRINI]

The former girlfriend of Jerome Boateng has been found dead.

The body of Kasia Lenhardt, 25, was discovered by police in her Berlin apartment on Tuesday.

Police are not treating the death as suspicious.

Kasia began dating Bayern Munich defender Boateng just over a year ago, but the couple broke up on February 2.

Boateng confirmed the break-up on Instagram, writing: "As is known from the media, I ended the relationship with Kasia Lenhardt.

Kasia Lenhardt [Instagram]

"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 became famous back in 2012 after appearing on TV show Germany's Next Top Model.

Fellow model Sara Kulka confirmed the news of her death on Instagram.

Alongside a picture of the pair, she 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."