( CNN ) -- The killings of four people , including two U.S. Navy pilots , in a Coronado , California , apartment early New Year 's Day was a murder-suicide , investigators said Wednesday . Lt. J.G . John R. Reeves , 25 , put a gun to his own head and killed himself after shooting to Lt. J.G . David A. Reis , 25 ; Karen Reis , 24 ; and Matthew Saturley , 31 , according to the San Diego County Sheriff 's Department . The murder-suicide conclusion was based on the medical examiner 's autopsy , the sheriff 's statement said . Homicide detectives will not provide a suspected motive for Reeves ' actions until more interviews are conducted and evidence is collected , the sheriff 's statement said . `` It is anticipated this process , and the crime laboratory report , could take several weeks , '' the statement said . The two Navy officers , roommates in the apartment where the shootings happened , were F/A-18 jet pilots assigned to Marine Fighter Attack Training Squadron 101 , Marine Aircraft Group 11 , Third Marine Aircraft Wing , the Navy said . Reeves earned his Navy commission through the ROTC program at Penn State University in 2008 , while Reis was commissioned in the Navy after completing the ROTC program at the University of New Mexico the same year , the Navy said . The Coronado Police Department got a call around 2:20 a.m. Sunday about shots being fired inside a condominium in the coastal city , which is just southwest of San Diego . Responding officers found a man 's body in the doorway and the other bodies inside the residence , according to a press release from Lt. Larry Nesbit of the San Diego County Sheriff 's Department .
Police find two bodies in a Coronado , Coronado , apartment 31 . Investigators say Navy pilot J.G killed another pilot and two others . Reeve 's motive is unknown , sheriff 's investigators say . Navy is a coastal city near San Diego .