Luchador Wrestler Dead At 26

Principe Aéreo -- a star wrestler in Mexico -- died at 26-years-old after collapsing in the ring during a match over the weekend.

The tragic scene all went down Saturday at Arena San Juan Pantitlan in Mexico City during a Mexa Wrestling event.

Principe -- real name Luis Ángel Salazar -- was performing in a tag team match ... and everything appeared to be going smoothly.

The luchador was hamming it up for the crowd ... and then took two slaps to the chest and a kick to the stomach -- when suddenly he appeared to faint onto the mat.

Video showed his opponent and the in-ring ref immediately knew something was very wrong ... and within minutes, the wrestler was reportedly rushed out of the building…