A married couple were found fatally shot in the garage of their south Las Vegas Valley apartment Thursday night in what police believed to be a murder-suicide.

The man and woman, both in their 30s, were found around 8 p.m. at the Arista Apartment Homes complex near East Starr Avenue and Bermuda Road. The couple was arguing and witnesses told police they heard two gunshots, according to Metropolitan Police Department Lt. Jason Johansson.

He said the couple’s three children were found unharmed inside the apartment. Johansson described one child as being really young and the two others as young teens.

“It’s a very tragic case where we have three juveniles that now are without their mother and their father,” Johansson said.

He said it was too early to say which person killed the other.

Contact David Wilson at dwilson@reviewjournal.com. Follow @davidwilson_RJ on Twitter.