The stalker, a man in his late 20s, is said to follow Balan wherever she used to go, and even turned up at her flat once, but the actress wasn't at home at the time.
"He used to be there on her sets. He used to be there in her building. Once unknowingly, Vidya even nodded to him and said namaste," a friend of Balan said.
Later, when she got suspicious, the star asked the security guards to keep an eye out for him and when he returned they called the police. However, the police left him with just a warning.