Two people found dead at their La Quinta home on Monday died from what appears to be a murder-suicide, investigators said Wednesday.

About 9 a.m. Monday, investigators were called to a home in the 79-000 block of Independence Way, where they found Ada Heintz, 44, dead from a fatal gunshot wound, according to the Riverside County Sheriff's Department. Inside, they found Herman Heintz, 59, dead from a self-inflicted gunshot wound.

Investigators continue to stress there are no outstanding suspects or threats to the public, but details on a possible motive have yet to be released.

The Heintzes are listed as Imperial Irrigation District employees on Transparent California, a public pay and pension database. IID spokesman Robert Schettler also confirmed the married couple's employment.

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Previously:La Quinta homicide investigation enters second day; family says dog missing

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Ada Heintz was hired in February 2000 and most recently worked as a service desk technician, according to details provided by Schettler.

Herman Heintz was hired in January 1978 and was most recently a service representative.

They both worked in the district's La Quinta office.

"The district is providing voluntary grief support services (group and individual) to employees to help cope with the shock and loss," Schettler said in an email.

In a statement issued later, the district said it "is deeply saddened to learn about the unexpected and tragic passing of two of its employees, Mr. Herman Heintz and wife Ada Heintz. The district grieves with their families, their loved ones and is focusing on the human aspect of this situation, doing what it can as an organization to support them.''

Their employment is the first look into the lives of the Heintzes. Family members have declined to comment beyond lamenting the lack of information on the case and asking for help finding a dog that escaped from the Heintzes' home.

The couple's marriage in 2007 was marred by a couple of setbacks.

They filed for summary divorce judgments twice within two years. During the initial divorce proceeding in March 2008, Herman Heintz requested a restraining order against his wife. Neither divorce request was finalized and it appears the matter was dropped by 2012.

Relatives spent much of Tuesday looking for the missing dog George, who was described as blind and partially-deaf. He was found safe Tuesday afternoon.

"That really brought peace to our family," Kayla Adkins, who identified herself as Ada Heintz's niece, said Tuesday night.

She told The Desert Sun that family members want information about what happened to the couple.

"We honestly don’t know anything," she said. "We just know as much as the public does."

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Investigators remained at the scene well into Monday night but they were gone by Tuesday morning.

The case is the Coachella Valley's first homicide investigation of 2019.

Last year, 16 homicides occurred across the Coachella Valley.

Among them was a Sept. 13 killing in the La Quinta Cove neighborhood, which was the city's only homicide of 2018. It was also a murder-suicide.

Stacy Rowan opened fire on his sister and her husband when they came to his home on Avenida Vallejo. The husband died, but the sister fled and hid after neighbors rushed to assist her.

Rowan led authorities on a chase along Interstate 10 before shooting himself near Inland Empire Boulevard in Ontario. He died two days later.

Before that, in October 2014, another murder-suicide occurred at a home on Avenida Carranza, which also is in the La Quinta Cove.

Investigators said Robert Bertrand shot his brother and sister during an argument before turning the gun on himself.

Both brothers died, but the sister drove from the scene and was discovered near Washington Street by sheriff's deputies investigating an unrelated traffic collision.

Desert Sun reporter Colin Atagi covers crime, public safety and road and highway safety. He can be reached at Colin.Atagi@desertsun.com or follow him at @tdscolinatagi.

Desert Sun reporter Shane Newell contributed to this story.