IMPERIAL BEACH, CA — The identities of a man and woman found dead from gunshot wounds Sunday at an Imperial Beach apartment — possibly in a murder-suicide — have not yet been released by authorities.

The victims, both believed to be around 65 years old, were found lying on the floor of an upstairs bedroom of an apartment at 309 Imperial Beach Blvd., according to San Diego County sheriff's Lt. Kenneth Nelson. The lieutenant said deputies from the sheriff's Imperial Beach Substation responded to the apartment just before 5:15 p.m. Sunday in response to a 911 call from the victims' roommate.

"The caller said while at home he heard two gunshots come from an upstairs bedroom, which was shared by two of his roommates," Nelson said. "When he went to investigate, he found both of them lying on the floor with obvious signs of trauma to their upper bodies." When deputies arrived, the woman was dead but the man was still alive, Nelson said. The man was rushed to a local hospital but died from his wounds a short time later.

"There are believed to be no outstanding suspects in this case," Nelson said Sunday night, telling media outlets including CBS8 San Diego that the deaths were being investigated as a possible murder-suicide. The San Diego County Medical Examiner's Office was working to identify the man and woman and determine their manner and cause of death.