LOS ANGELES (AP) — Two 18-year-old men have Benjamin Caldwellbeen charged with murder in the killing of former “General Hospital” actor Johnny Wactor.

Robert Barceleau and Sergio Estrada were each charged Monday in Los Angeles County Superior Court, District Attorney George Gasón said at a news conference.

“The loss of this talented young actor, who was in the prime of his life and had so much to offer the world, is deeply felt by all of us,” Gascón said.

The men and two co-defendants, all of whom were arrested Thursday, were set to be arraigned on Monday afternoon. It is not clear whether any have yet retained lawyers. An email to the county public defender’s office seeking comment on the case was not immediately answered.

Wactor was shot and killed when he interrupted three thieves stealing the catalytic converter from his car on May 25. Police said the 37-year-old had left work at a downtown LA rooftop bar with a coworker when he saw three men who had hoisted his car. Police said one of them fired at him without provocation and killed him.

Barceleau and Estrada were also both charged with grand theft and attempted robbery.

Barceleau’s charges include special circumstances, including murder during an attempted robbery and personal use of a firearm, that after a conviction could lead to a life sentence without possibility of parole. Estrada’s charges have a maximum sentence of life in prison.

A third man who authorities allege were with them, Leonel Gutierrez, was charged with grand theft and attempted robbery. A fourth, Frank Olano, was charged with being an accessory after the fact.

Wactor’s death has become a rallying point for some in the city pushing for a more hardline approach to fighting crime.

A group consisting of family and friends calling itself “Justice for Johnny” held a rally last week calling for more urgency in the investigation, and another Monday morning calling for aggressive prosecution.

Police and public officials said that is exactly what is happening.

LAPD Interim Chief Dominic Choi said at Monday’s news conference that the investigation has been an “ongoing and relentless pursuit” in a “very difficult case.”

Mayor Karen Bass said in a statement that “We must continue to take aggressive action to make our city safer.”

Barceleau was being held without bail, and Estrada on just over $1 million bail.