Thane: A 55-year-old watchman deployed at a housing society was allegedly killed by a fellow security guard on Mira Road area here, police said today.

The accused, Janak Sharma (25), who also worked as a watchman in another housing society on Mira Road, allegedly called Ramsingh Bhandare on the terrace of a building where he slit the latter's throat with a sharp weapon yesterday, police inspector Dhanaji Kshirsagar said.