Prabhakar Sail, an independent witness of the Narcotics Control Bureau in the drugs-on-cruise case involving Aryan Khan, died of a heart attack at his residence in suburban Chembur, police said on Saturday.
He was rushed to the civic-run Rajawadi Hospital in Ghatkopar, where he was declared brought dead, he said.
Aryan Khan was named an accused in the case along with 19 others by the NCB.