The brother of slain Barnard College freshman Tessa Majors paid tribute to his sister on Thursday in an emotional social-media post.

“rest in peace to the best sister and friend someone could ask for,” wrote Maxwell Majors on Instagram, captioning a photo of the siblings together as young children. “i love you tessa rane.”

Majors, 18, was found fatally stabbed inside Morningside Park around 5:35 p.m. Wednesday in what police sources have called a robbery gone wrong.

She was found near the corner of West 116th Street and Morningside Drive by a school security guard, bleeding from a slew of wounds to her face, neck and arm, authorities and sources have said.

Investigators are questioning “persons of interest” as they attempt to sort out whether Majors fell victim to a string of robberies plaguing the area of late.

Maxwell Majors’ loving remembrance of his sister echoes recent social-media posts by their father, describing Tessa as a “fantastic young lady.”

A bandmate of Tessa’s also took to Instagram to memorialize the teen.

“I wish I could rewind,” wrote the user, using the handle beamer337, in posting an undated video clip of Majors jamming on stage.

“This one was heartbreaking and just different,” the post continued. “To my stage buddie, partner in crime, band mom, friend, and mentor, I love you.

“Tess I wish I could jam one more time with you. … Whenever I hit the stage you’ll be in my mind.”