April Mahoney was so desperate to find her missing fiancé, Clayton McGeeney, that she took matters into her own hands a little after 9 p.m. on January 9.

She pounded fruitlessly for 10 minutes on the door of the Kansas City, Missouri, rental belonging to Jordan Willis, where McGeeney and his friends were last seen two days earlier.

Then she broke in through a basement window, yelling to see if there was anyone in the house, a relative told The Post.

Next she walked upstairs, looked out the large back windows and saw a grisly tableau on the snow-covered patio.

Mahoney first spotted the frozen body of one man, David Harrington, seated upright in a lawn chair.

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She was so upset that she did not immediately see that her fiancé was also dead on the ground, beside a third man, Ricky Johnson, who was also dead.

“April saw David and she totally panicked and almost couldn’t breathe and she called the police,” Clayton’s uncle, Jim McGeeney told The Post.

“The cops showed up within minutes and Jordan opens the door no problem, wearing his boxers and holding an empty wine glass.”

Since then, the mystery of how McGeeney, 36, Harrington, 37, and Johnson, 38, died seemingly simultaneously in the snowy backyard while Willis, their host, a 38-year-old HIV research scientist, said he had been sleeping for 48 hours and had no idea his buddies had expired in full view of the house, has only deepened.

The temperature in the backyard in the early morning hours of Jan. 8 when the men died was just about freezing.

Preliminary toxicological results Thursday indicated the men died from the effects of cocaine and fentanyl.