Let's see the news from - Bernama/CNA/de/xq
Bernama news agency quoted Kampar's OCPD Supt Ng Kong Soon as saying that Karpal Singh and his personal assistant Michael died on the spot, at Km306.1 on the north-bound stretch of the highway.
It involved an MPV vehicle and a lorry.
Supt Ng said Karpal Singh's maid, an Indonesian woman, was badly injured while his son, Ram Singh, 38, and the driver of the MPV were unhurt.
He said the white Toyota Alphard MPV carrying Karpal Singh and four other people from Kuala Lumpur to Penang was involved in the collision with the lorry at a hilly stretch of the highway.
The five-tonne lorry was carrying a load of cement, steel and mosaic tiles, he added.
Supt Ng said the injured maid and the bodies of Karpal Singh and Michael were taken to the Raja Permaisuri Bainun Hospital.
Tributes poured in for Karpal Singh after Malaysians heard news of his death.
As Malaysians offered prayers and condolences to the family, the nation mourned the passing of a feisty politician, fondly remembered for his fighting spirit and righteousness.
Karpal Singh had been a controversial figure in Malaysia's politics. He joined DAP in 1970.
Throughout his 40-year political career, he had been held under the country's security laws, suspended from parliament numerous times and just last month he was forced to resign as his party chairman after he was convicted of sedition.
Karpal Singh was detained for more than a year without trial in the 1980s on allegations of inciting racial tensions, and was listed by Amnesty International as a prisoner of conscience.
He later found fame in 1998 for his part in defending opposition leader Anwar Ibrahim against allegations of sodomy. Anwar's initial conviction was later overturned in 2004.
Karpal Singh's reputation as a feisty lawyer won him the moniker "Tiger of Jelutong", after the name of the constituency he helmed for five terms.
Anwar said the news of Karpal Singh's death came "like a lightning bolt".
"Just last evening, I had had a lengthy chat with him," he said in a statement, expressing "profound sadness".
Despite being wheelchair-bound after a road accident in 2005, Karpal Singh remained a fighter both in courtrooms and in parliament.