CORONADO — A Navy pilot armed with a rifle and a pistol lay in wait upstairs for his roommate and two other people to enter a Coronado condominium on New Year’s Day, then he systematically shot and killed each one before killing himself, sheriff’s officials have concluded.

Homicide detectives ended a four-month investigation unable to confirm a clear motive for the murders committed by John Robert Reeves, they said Wednesday.

“Only one person knows the true motive — John Reeves — and he took that to the grave with him,” said sheriff’s homicide Capt. Duncan Fraser.

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