Ariana Grande says the Manchester attack "seems impossible to fully recover from".
The Florida-born beauty wrote the letter February 22, 2018, eight months after the incident.
"Opening up in a new documentary series, Ariana is giving fans a behind the scenes look at her 'Dangerous Woman Tour".
And in her letter, Ariana praised the people of Manchester for their "love, strength, and unity" in the wake of the ordeal, as she said they taught her "not to be defeated".
The manager, who also represents Justin Bieber and Martin Garrix, continued to say "Show respect because trust me everyone on this side knows he deserves it and wishes him well".
Syria shoots down 'hostile target' near Damascus: State media
In 2017, the BBC, quoting a Western intelligence source, reported the Iranian military had a compound outside Al Kisweh. On Friday, a senior Syrian defense official refuted previous reports of air defense hitting an Israeli plane.
As fans know, the "sweetener" singer plays homage to four classic flicks in the music video: Mean Girls, Legally Blonde, Bring It On, and 13 Going On 30.
"When something so opposite and so poisonous takes place in your world that is supposed to be everything but that.it is shocking and heartbreaking in a way that seems impossible to fully recover from".
"It is comfort. It is fun". It is the last thing that would ever harm someone.
The letter adds: "The spirit of the people of Manchester, the families affected by this horrendous tragedy, and my fans around the world have permanently impacted all of us for the rest of our lives". To continue during the scariest and saddest of times.
The new series does not include any footage from the Manchester Arena bombing, but does show some of the One Love Manchester benefit concert Grande organised to raise money for victims and their families. But instead, love as loudly as possible, and to appreciate every moment'.
"'Like a handprint on my heart, I think of Manchester constantly and will carry this with me every day for the rest of my life".