Heath Ledger's parents are still struggling to come to terms with their son's untimely death as the fifth anniversary of his passing looms.

The Australian actor was found dead at his New York apartment on 22 January, 2008 following a prescription drug overdose.

His family and fans will remember his passing in the coming weeks, and his mother, Sally Ledger, has now admitted the pain of losing her son is not getting any easier as the years go by.

In a new interview with Australia's New Idea magazine, she says, "It has been an extremely difficult five years, as not a day goes by when we don't feel the immense loss of Heath."

Ledger left behind a daughter, Matilda, with his former girlfriend Michelle Williams, and Sally reveals the little girl is very similar to her famous father.

She adds, "(Matilda is) very much like her dad however she also possesses the beauty of her mamma."