The running mate of assassinated Ecuadoran candidate Fernando Villavicencio will run for president in his place in 20 August elections, their party said.
"The movement will replace the presidential ticket by putting Andrea Gonzalez as president," the centrist Construye party said in a statement.
Mr Villavicencio, a 59-year-old journalist and prominent anti-corruption crusader, was shot dead as he left a campaign rally in the capital Quito on Wednesday night.
President Guillermo Lasso has blamed the murder on organised crime.
Ms Gonzalez, 36, is due to participate in today's presidential debate in Quito.
Her work has been focused on environmental advocacy, particularly concerning oceans and mangroves, as well as combatting wildlife trafficking and deforestation.
"The name of the vice presidential candidate will be announced in the next hours and will be chosen among the most trusted of those who have shared the struggles of comrade Fernando Villavicencio," the party said.
Meanwhile, Ecuador transferred a powerful gang leader, accused of threatening Mr Villavicencio before he was murdered, to a maximum-security prison via a massive military and police operation, officials said.
Early this morning, around 4,000 heavily armed agents entered Prison 8 in Guayaquil in southwestern Ecuador, where the head of the powerful Los Choneros criminal group, Jose Adolfo Macias, alias "Fito," was being held.
Images shared by security forces showed a bearded man in his underwear, with his hands on his head in some shots and lying on the floor with arms tied in others.
President Lasso reported on social media site X, formerly known as Twitter, that "Fito" had been transferred to La Roca, a 150-person maximum security prison that is part of the same large penitentiary complex he was already in.
The gang leader had controlled at least one cellblock in the prison from which he was removed.
Ecuador has been under a state of emergency after assassination of Mr Villavicencio.
Mr Lasso has blamed the murder on organised crime, and Mr Villavicencio had complained of receiving death threats from Macias.
A week before the 59-year-old was killed, he had said that "Fito" was threatening him.
Mr Villavicencio told a local programme that an "emissary" of the gang leader had contacted him and warned "that if I continue... mentioning Los Choneros, they are going to break me."
'Unjustifiable violence'
Mr Villavicencio drew the ire of gangs and drug traffickers for his investigations.
Six Colombians have been arrested in his murder, while a seventh was killed in a shootout with his bodyguards. Authorities have not said who hired and paid the hitmen.
"Fito" had been sentenced to 34 years in prison for organised crime, drug trafficking and murder.
Prisons have become the center of operations for drug trafficking in Ecuador.
More than 430 inmates have died violently since 2021, dozens of them dismembered and incinerated amid disputes between rival gangs.
The global community has condemned Mr Villavicencio's murder, including the UN, United States and European Union.
On Saturday, Pope Francis rejected the violence plaguing Ecuador in a message to the Archbishop of Quito, Alfredo Espinoza.
The pope condemned "with all his strength" the "suffering caused by unjustifiable violence."
