Selena Gomez responds to Christina Grimmie's death: 'My сердце is broken' 

Christina Grimmie remembered by Blake Shelton, Demi Lovato, more

Christina Grimmie: 10 performances to remember 'The Voice' singer

Christina Grimmie: Police identify singer's killer

Selena Gomez says the death of her longtime friend Christina Grimmie has left her heartbroken.

“My heart is absolutely broken,” the singer wrote alongside a photo of the pair on Twitter. “I miss you Christina.” 

Grimmie, who developed a following on YouTube, was discovered by Gomez’s stepfather Brian Teefey in 2010. After the singer released her first EP a year later, she became a supporting act for Gomez during the U.S. leg of her

season 6, Grimmie reunited with the “Hands to Myself” singer for her

My heart is absolutely broken. I miss you Christina pic.twitter.com/KWGwZZlj4t

The two also featured in a promo for the Xbox 360 Kinect console in 2011. Watch it below. 

Grimmie praised Gomez and her family during a 2011 interview with

magazine. “I’m so blessed that they’re in my life,” she said. “They’re literally like a family – Selena has been so encouraging ever since we got hooked up. It’s crazy! It’s very much a fairy tale.”

Grimmie was shot after a show in Orlando, Florida, and later died due to her injuries. She was 22 years old.

Following her murder, Teefey created a GoFundMe page in support of the singer’s family.

“Words cannot begin to describe the pain I am feeling,” he said in a statement. “I learned this business through the eyes of a father, and Christina was like a second daughter to me. All I wanted to do was assist her in achieving her musical dreams while protecting her from the pitfalls associated with the business. I never could have imagined this horrific event being one of the pitfalls needing to be avoided.”

\'Ugly Betty\' cast reunites at ATX Television Festival: See the photo

\'Once Upon a Time\' bosses tease new format for season 6

\'Ugly Betty\' reunion panel: EW live blog

WATCH: Ellen DeGeneres reveals her greatest extravagance

Logo TV to raise awareness of anti-LGBT issues by censoring itself

Selena Gomez: \'My heart is broken\' over Christina Grimmie\'s death

\'Friday Night Lights\' Reunion at ATX Festival: See the Photos

\'Mr. Robot\' Exclusive: EW Takes fsociety to Wall Street

See The Voices Behind Your Favorite \'Cars\' Characters