A veteran custodian allegedly shot his female colleague before turning the gun on himself in an apparent murder-suicide at an Illinois elementary school, according to reports and authorities.

A 63-year-old man and a 48-year-old woman — both identified by their union as custodians — were discovered unresponsive with single gunshot wounds to their heads inside Mark Twain Elementary School around 3:40 p.m. on Monday, a Chicago Police Department spokesperson told The Post.

The male custodian allegedly approached his female colleague from behind as she walked down the school’s hallway and shot her in the head from close range, according to police…

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