UPDATE: Sheriff says murder suspect admitted killing Reno couple

Update 5:35 p.m. Friday:

A sheriff's report says a 19-year-old from El Salvador admitted killing a married couple in Reno and used a handgun that he said he stole earlier from their home do it, the Associated Press has reported.

The report filed with a judge Thursday in Carson City says the gun is believed to be the weapon also used to kill two women in their homes in Gardnerville.

Carson City Sheriff Ken Furlong released the declaration of probable cause Friday in response to a request from the Associated Press.

It says Wilber Martinez-Guzman admitted using a .22-caliber revolver stolen previously from the home of Gerald and Sharon David in Reno to kill them on Jan. 16.

The gun was recovered from a BMW in which authorities arrested Martinez-Guzman on Jan. 19 in Carson City.

Original story:

Note: The story was changed to show the news conference is set for 12 p.m. on Monday at the Washoe County District Attorney's Office in downtown Reno.

The Washoe and Douglas County district attorney’s offices are expected to release more details on whether formal criminal charges will be filed in connection to the recent four murders in South Reno and Gardnerville at a news conference on Monday.

Wilbur Martinez-Guzman is the only suspect linked to the deaths of the four victims. He was arraigned on Thursday on 36 counts, all of which relate to felony weapons charges, burglary and possession of stolen items.

He was also being held on an immigration hold.

Formal murder charges have yet to be filed but are expected in the coming days.

MORE NEWS:

Carson City woman speaks about her friendship with murder suspect Wilbur Martinez-Guzman

Updated court doc: Reno, Gardnerville murder suspect had several stolen guns

Carson City: Wilbur Martinez-Guzman allegedly pawned murder victims' jewelry at coin shop

The news conference is set for 12 p.m. Monday at the Washoe County District Attorney’s Office on South Sierra Street, according to a recent news release.

Both Douglas County District Attorney Mark Jackson and Washoe County District Attorney Chris Hicks will update the public on their decision regarding the murder charges.

Washoe County Sheriff Darin Balaam, Douglas County Sheriff Dan Coverley and Carson City Sheriff Ken Furlong are also expected to attend the news conference.

On Jan. 10, Connie Koontz, 56, was found dead in her home in the Gardnerville Ranchos area. Then on Jan. 13, 74-year-old Sophia Renken’s body was discovered by a friend at her home — which was located about a mile away.

On Jan. 16, both Jerry David, 81, and his wife, Sherri, 80, were also killed in their home on La Guardia Lane in South Reno. All of the victims were shot and killed, according to investigators.

A criminal complaint showed Martinez-Guzman, who was 19 at the time of the alleged crimes, attempted to pawn several pieces of jewelry, multiple firearms and other items that belonged to Sherri and Jerry David.

He was also found with belt buckles that bore the slain couple’s name, the complaint said.

He was also found with jewelry that belonged to Koontz. At his arraignment hearing on Friday, Judge Tom Armstrong said Martinez-Guzman was also found with an Apple Watch and Apple computer, both of which belonged to Koontz.

None of the charges referenced stolen items from Renken, the fourth murder that has been attributed to Martinez-Guzman.

Check with RGJ for more updates as they become available.