A man who formerly advised the Honduran government on the battle against drug trafficking was fatally shot Wednesday while driving through Tegucigalpa, police said.

Alfredo Landaverde died at the scene and his badly wounded wife was rushed to the capital's Teaching Hospital.

The country's president, Porfirio Lobo, interrupted his speech at a public event to lament the murder of Landaverde, describing the deceased as "a great Honduran."

Vowing a thorough investigation of the murder, Lobo said he would continue his struggle to improve public safety, a goal that has eluded him since he took office in January 2010.

Honduras experiences an average of 20 homicides a day and is the most dangerous nation in Central America as measured by the number of murders per every 100,000 residents.

Lobo said Wednesday that levels of violence have declined since Nov. 1, when his government launched "Operation Lightning," a crime-suppression effort involving hundreds of police and soldiers.

Landaverde was an outspoken critic of organized crime and police corruption, both of which have flourished in Honduras in recent years.

Alfredo's brother Moises Landaverde, a teacher, was gunned down in January 1988 along with human rights activist Miguel Angel Pavon.