Hometown Heroes Survivors Benefits Act of 2003 - Amends the Omnibus Crime Control and Safe Streets Act of 1968 to provide that a public safety officer who dies as the direct and proximate result of a heart attack or stroke shall be presumed to have died as the result of a personal injury sustained in the line of duty, for purposes of survivor benefits, if: (1) that officer, while on duty, engaged in a situation involving non-routine stressful or strenuous physical law enforcement, fire suppression, rescue, hazardous material response, emergency medical services, prison security, disaster relief, or other emergency response activity or participated in a training exercise that involved non-routine stressful or strenuous physical activity; (2) that officer died as a result of a heart attack or stroke suffered while participating, while still on duty after participating, or not later than 24 hours after participating in such activity; and (3) such presumption is not overcome by competent medical evidence to the contrary.