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VIDEO: Lady Gaga sings emotional tribute to "little monster" Jamey Rodemeyer, who was bullied to death

LAS VEGAS -- Pop superstar Lady Gaga dedicated her rendition of "Hair" at the iHeartRadio Music Festival to 14-year-old Jamey Rodemeyer of Buffalo, N.Y., who killed himself on Sept. 18 after enduring endless anti-gay bullying online and at school.

An emotional Lady Gaga told the huge audience: "I just wanted to take a moment because we lost a little monster this week. Jamey, I know you're looking down on use and you're not a victim, you're a lesson to all of us."

Jamey sent a "thank you" message to Lady Gaga just before taking his own life.

"Bye mother monster, thank you for all you have done, paws up forever"

More than 500 mourners, including many strangers who were touched by the tragedy, attended Jamey's funeral Mass on Saturday. Jamey was buried in his favorite Lady Gaga T-shirt.

Jamey documented the torment he faced on his Tumblr account and even posted a notice earlier this month to inform everyone that is was National Suicide Prevention Week.

Tracy Rodemeyer, Jamey's mother, told the media that her son was questioning his sexuality and that fellow students used that to bully and taunt him.

Meanwhile, authorities are considering criminal bullying charges after opening a criminal investigation into the suicide case.