Reporters Without Borders expressed its anger and concern after the murder of prominent and outspoken television journalist Carlos Guadamuz.
Guadamuz, producer and presenter of the broadcast "Dardos al Centro", put out by CDNN (also known as Channel 23), was shot dead in front of the channel's studios as he arrived for work on 10 February.
The killer shot him several times at point blank range with a 38 revolver. Station staff immediately overpowered the gunman and he was identified as William Hurtado García. Eyewitnesses said he had been lying in wait for his victim for almost an hour.
"Reporters Without Borders welcomes the fact that the killer was arrested and your commitment to track down all those who were implicated in this cowardly act," the international press freedom organisation said, in a letter to President Enrique Bolaños
Insisting on being kept informed of the progress of the investigation, Reporters Without Borders added, "since several people believe the killing was linked to the journalist's public stances, we call on you to do everything possible to uncover the motives for the murder."
"If it turns out to be the case that Guadamuz was killed for his opinions or his work, that would be very bad news for democracy in Nicaragua, where no journalist has been killed for several years," it added.
Guadamuz, a leading journalist, was head of public radio La Voz de Nicaragua at the time of the Sandinista revolution (1979-1990) then of Radio Ya, the radio of the Sandanista National Liberation Front (FSLN), until 2000 when he was expelled after deciding to stand for a seat on Managua's municipal council.
He then became closer to the right-wing Constitutional Liberal Party (PLC) and got a job working for the public Canal 6 until it closed in 2002. For the past several months he rented a slot on CDNN for his daily broadcast, which was known to be very hard-hitting and fiercely critical of the FSLN.
The victim's oldest son accused the party's leader Daniel Ortega, of being the "chief suspect" in the death of his father. "He is my father's biggest enemy," he told the local press.
In a statement the FSLN condemned the murder which it also described as a set up. "This murder was carried out to make it look like the FSLN was behind it. There is no doubt about that," said Tomás Borge, deputy general secretary of the party.