Unidentified motorcycle-borne persons shot dead a government doctor near the gate of the Doctors' Colony, under the Cantonment police station, in Varanasi on Thursday morning.
The murder of Dr DP Singh prompted doctors of government hospitals and health centres to go on a strike following a call by the Provincial Medical Services' Association.
Medical services at private nursing homes were also affected.
Reports said three assailants opened fire on Dr Singh when he was on a morning walk. He died on the spot.
Police have launched a manhunt for the accused. Dr Singh, hailing from Chhapra in Bihar, was transferred to Deen Dayal Hospital in Varanasi from Jaunpur two years ago. He was transferred to the Hathibazar based Community Health Centre (CHC), under Jansa police station, recently.
His wife Shilpi Rajput was also a doctor and owned a nursing home in the Orderly Bazaar area. He is survived by a daughter and a son.
Provincial Medical Services' Association general secretary Dr Arvind Singh said medical services in all government hospitals were crippled due to the doctors' strike.
Services at the Deen Dayal Hospital, the Shiv Prasad Gupta Divisional Hospital, Community Health Centres and Primary Health Centres were affected.
Doctors boycotted emergency services at the Deen Dayal Upadhyay Hospital as well. They persuaded their colleagues at the Shiv Prasad Gupta Divisional Hospital to join the strike. The PMSA will hold a meeting later to chalk out the course of the agitation.