An Ontario doctor accused of sexual assaulting a woman earlier this year faces more charges after another woman alleged he drugged and assaulted her eight years ago.

Toronto police announced fresh charges on Tuesday against Dr. Amitabh Chauhan, 33, of Ancaster.

It is alleged that in September or October of 2003 the suspect met a 21-year-old victim in Kingston and put an unknown substance in her drink. He is accused of then sexually assaulting her.

Chauhan has been charged with administering a drug for sex and sexual assault. He is scheduled to appear in court at Old City Hall on Tuesday.

Chauhan was previously accused alongside another doctor of gang sexual assault, as well as administering a noxious substance.

The charges were laid after a 23-year-old woman told police she met two men at a Toronto bar on Feb. 13. She says something was slipped in her drink and she was then sexually assaulted in a Toronto hotel.

Chauhan and Dr. Suganthan Kayilasanathan were released on bail in February and hired a public relations firm to help declare their innocence.

The pair has been friends since childhood. Kayilasanathan works as a family physician at a clinic on Markham Road, while Chauhan works in the plastic surgery department at Hamilton's McMaster University.

Chauhan, a naval reservist with the Canadian Forces, graduated from Kingston's Royal Military College in 2002. In 2004 he began training to become a pilot but left the program the following year, according to the Department of National Defence.

Chauhan joined the naval reserve in 2008 and holds the rank of acting sub-lieutenant.

Police believe there are other victims and ask anyone with information to contact police at 416-808-7474 or Crime Stoppers anonymously at 416-222-TIPS (8477).