Brothers die in Contra Costa murder-suicide

John Bartlett shows the crime scene tape he picked up near the site where two men were shot and killed on Altamont Creek Drive near Winding Stream Drive in Livermore, Monday, March 2, 2015, in Livermore, Calif. Bartlett said he's here to clean up as he does not what the children at a nearby school to find items from the incident. A man has been arrested in connection with the Sunday afternoon shooting, police said. The location of the shooting took place near Altamont Creek Elementary. less John Bartlett shows the crime scene tape he picked up near the site where two men were shot and killed on Altamont Creek Drive near Winding Stream Drive in Livermore, Monday, March 2, 2015, in Livermore, Calif. ... more Photo: Santiago Mejia, The Chronicle Photo: Santiago Mejia, The Chronicle Image 1 of / 1 Caption Close Brothers die in Contra Costa murder-suicide 1 / 1 Back to Gallery

Contra Costa County authorities identified two brothers who died Thursday in what investigators say was a murder-suicide.

The brothers were identified as Richard Gilmore, 64, and John Gilmore, 67, both of Pacheco, said Jimmy Lee, a spokesman for the Sheriff’s Office.

Deputies responded around 1 p.m. to a report of a disturbance on the 100 block of Dalton Court in the unincorporated area between Concord and Martinez.

As deputies were on their way, the call was upgraded to “shots fired,” Lee said. When they arrived, they found Richard Gilmore with multiple gunshot wounds and John Gilmore with one wound. Both men soon died.

Lee would not confirm that John Gilmore was suspected of shooting his brother, but he said the crime was considered a murder-suicide.

Kale Williams is a San Francisco Chronicle staff writer. E-mail: kwilliams@sfchronicle.com Twitter: @sfkale