Reality TV star Scott Disick . Photo: Steve Marcus

London - Scott Disick's father has died.

The Keeping Up With The Kardashians star is mourning the passing of his father, Jeffrey Disick, a real estate developer, according to The cause of Jeffrey's death is unknown at present.

The news comes at a very sad time, as it is less than three months since Scott lost his mother, Bonnie, aged 63, who died after a long battle against cirrhosis of the liver on October 28.

Scott - an only child - attended her small funeral in New York on October 30 with his long-term girlfriend, Kourtney Kardashian. Sources close to the couple - who have Mason, three, and Penelope, 17-months, together - say Bonnie's passing had made Scott more responsible and brought him closer to Kourtney.

A source said: “Scott's been more emotional since his mom died. He's now more dependent on Kourtney. It really affected him. He's staying at home more and being a much better father. Scott has grown up a lot. He's much more responsible.”

Scott is yet to comment on his father's passing and has not posted anything on social media in 2014.