A welfare check led Suffolk County police to discover a murder-suicide inside a Port Jefferson home.

According to investigators, police said they arrived at 135 Oakwood Rd. around 11 a.m., after Valerie Kopetic, 63, didn't show up to work earlier in the day on Monday.

Once inside, officers discovered Kopetic and her domestic partner, Paul Trefimovich, 68, both dead from gunshot wounds.

Suffolk County police believe Tremfimovich shot Kopetic, then himself.

Suffolk County police have not revealed the circumstances that led up to the shooting and added that they did not have information on whether officers had responded to the home for prior domestic incidents.

"It's a good neighborhood over there, actually, it's very good," one Port Jefferson resident said. "I'm very surprised to hear that."

Kopetic was the Long Island Adolesent and Family Services, Inc. Executive Director, the company confirmed. She worked primarily out of their administrative offices in Stony Brook, about 15 minutes from where she lived.

The social services agency said Kopetic had been there for at least 25 years, but declined to comment further at this time.

Detectives are asking anyone with information on this incident to call the Homicide Squad at 631-852-6392.