Leon Raj, 28 was arrested on July 1 and was taken into police custody from Kuttipuram. He was sent to Perinthalmanna sub-jail by the judicial first class magistrate court.
The police said that he was arrested because he was found moving in a suspicious circumstance.
He hailed from Tiruchirappalli, Tamilnadu and was the son of Kilapporur Thomas.
Doctors at the hospital said that he was suffering from leukemia. Raj died on Friday evening and his body is kept in the mortuary.