- Lajevardi was a follower of Ayatollah Kashani and Fadayian Islam. He was arrested and convicted on three occasions for militant activities. In 1964, he served 18 months for taking part in the assassination of the late Iranian prime minister Mansour. Later in 1970, he served three years in Evin prison for attempting to blow up the offices of El Al (the Israeli airline) in Tehran. Finally, he was once again arrested and sentenced to 18 years in prison, for being a member of the opposition militant group People's Mujahedin of Iran. He was among those who visited Ayatollah Khomeini in Paris when the latter was in exile.
On 23 August 1998, on the tenth anniversary of the mass executions, Ladjevardi was assassinated by members of the People's Mujahedin of Iran. Using an Uzi submachine gun the activists opened fire on Lajevardi and his bodyguard (who was also killed) at Lajevardi's tailor-shop in Tehran Bazaar.