Marak had laid down arms in 2014 and disbanded the ANVC-B militant group.
Former President A P J Abdul Kalam had congratulated a constable for remaining alert throughout the day, minutes before he collapsed at the Indian Institute of Management and died in Shillong on Monday night.
The Meghalaya government on Tuesday condemned attempts by Assam-based satellite television channels to create rift between different communities living in Assam and Meghalaya by spreading "unfounded" rumours.
Julius Dorphang, who was wanted in connection with a sex-racket case involving a 14-year old girl, was on Saturday arrested from his hideout in neighbouring Assam.
Former president A P J Abdul Kalam was admitted to a hospital in Shillong following a sudden illness on Monday.