A tragic love triangle was behind an alleged murder suicide in Queens on Saturday night — with the love interest witnessing the bloodbath, law enforcement sources told The Post.
Police came upon the bloody scene in Bayside shortly after 10 p.m., finding 17-year-old Neo Secaira with a gunshot wound to the chest and Frank Liu, 28, a US Marine about to be redeployed, dead from an apparent self-inflicted gunshot wound to the head, police said.
Both victims were taken to New York Presbyterian Hospital, where they were pronounced dead, according to police.
Sources said the mayhem stemmed from a love triangle involving the two dead men and an unidentified 19-year-old woman…