New Delhi: An LTTE leader who was once a deputy to its supreme leader Velupillai Prabhakaran was a RAW agent, recruited as early as 1989, a new book says. Journalist Neena Gopal, who interviewed former Prime Minister Rajiv Gandhi moments before he was assassinated in 1991, says that Gopalaswamy Mahendrarajah alias Mahattaya was a Research and Analysis Wing mole. "The man was cultivated and positioned by RAW as their mole inside Prabharkaran's hitherto impenetrable ranks as early as 1989," she says in her book "The Assassination of Rajiv Gandhi" (Penguin). "He would become their deep asset, the one who would subvert the insurgent movement from the inside, and had been tasked to eliminate Prabhakaran and take over the LTTE," the book says. RAW's links with Mahattaya, who the LTTE later executed on charges of being an Indian intelligence agent, was not known to the Indian Military Intelligence or the Intelligence Bureau, it says. The LTTE reportedly suspected that it was Mahattaya who tipped off the Indians about a Tamil Tiger ship in January 1993, leading to the death of former Jaffna LTTE commander Kittu, a childhood friend of Prabhakaran. According to the book, Mahattaya was reportedly seized by the LTTE and taken to a camp where he was "tortured over a period of several weeks and months until he could barely speak, sit or stand. "He was finally executed in December 1994, 19 months (later). Some 257 of his men were executed and their bodies dumped, LTTE style, in a pit and set on fire." Despite the RAW's covert penetration of the LTTE, the Indian military, civilian intelligence and its diplomats worked at cross-purposes when the Indian military was deployed in Sri Lanka's northeast in 1987-90, the book says.