Pop singer Charlie Puth expressed his grief onstage in a New York City concert through an emotional musical tribute on Saturday, June 11, a day after his friend and fellow YouTube star Christina Grimmie was murdered by a fan in Orlando, Florida.

“I was reading the news last night and heard that my good friend Christina Grimmie was killed, and I want to dedicate this song to her tonight,” Puth said. “I’ve been upset about this all day, mainly because I just never got to say what I wanted to say to her, and I feel like this song perfectly captures that.”

According to US Magazine, he then sang his hit “See You Again,” which he first recorded with American rapper Wiz Khalifa in memoriam of the late Paul Walker for the soundtrack of the action film “Furious 7.”

Grimmie passed away after sustaining grave injuries she got following three gunshots by a deranged fan named Kevin James Loibl in Orlando’s Plaza Live theater. The 22-year old New Jersey-based singer was signing autographs after her concert with band Before You Exit when Loibl approached and shot her.

Grimmie first shot to fame as a YouTube star covering popular songs on her channel zeldaxlove64. She then joined the sixth season of the reality singing competition “The Voice,” eventually placing third behind eventual winner Josh Kaufman and second placer Jake Worthington.

Puth’s partner in the song “We Don’t Talk Anymore,” Selena Gomez also paid tribute to Grimmie in a concert. Gomez, who sang the song “Nobody,” had an emotional breakdown onstage as she was close with Grimmie, Billboard reported.

Gomez’ stepfather, Brian Teefey, was the one who discovered Grimmie on YouTube when she was still a high school student. Teefey has then become her manager.