Two bodies were found in a home in Kiryat Akron, near Rehovot on Saturday night.
Magen David Adom paramedics called to the address said they found the bodies of man in his 20s and a woman in her 40s. Relatives of the deceased placed the bodies outside the home before the paramedics arrived.
Police forensic officers and homicide detectives have sealed off the scene and began collecting evidence.
The circumstances of the incident were not immediately clear, police said.