Edwin Grech, a former Labour minister and father of letterbomb victim Karin Grech, has died aged 94.

His death was announced by his nephew, Opposition leader Bernard Grech, in a Facebook post.

The Opposition leader praised his uncle as a person who had given everything for his ideals. 

He was also a person who had inspired him as a worker's son from the south of Malta to study at University and become a lawyer.

 "This was a person who only did good, and was paid back in the worst possible way, through the killing of his dearest daughter Karin," Grech wrote.

Karin Grech's murder has remained unsolved.

Karin Grech was killed aged 15 as she opened a letter addressed to her father on 28 December 1977, at the height of a doctors' strike. Her father, a gynaecologist, had at the time returned from the UK to work in government hospitals.

Grech later served as minister for social policy in the Sant government between 1996 and 1998.

Prime Minister Robert Abela also offered the Grech family his condolences, saying Grech had given "everything" to his country and his patients. 

In an interview with Times of Malta in December on the 45th anniversary of the murder of Karin Grech, her brother spoke about how his father had devoted his life to solving the murder. 

He had made a monthly appointment with the police commissioner to follow up the case, his son said.

The police used to brush him off but he persisted, trying to get information “on the side and from the underworld”.

However in recent years his father had been unwell and living in a care home.

To date, the crime that rocked the nation has remained unsolved.