“If you think gay teens like Lawrence King are safe in our schools,” says Grey’s Anatomy’s T. R. Knight, “you’re wrong.”

In partnership with GLSEN, LGBT-oriented television network Logo, in response to the recent murder of openly gay junior high student Lawrence King, is airing a public service announcement urging awareness and vigilance against homophobia, transphobia and discrimination in schools.

“One more murder, one more life lost, one more attempt to provoke fear and one more reason hate crimes must end,” said Brian Graden, President of Logo. “We hope this PSA will help inspire more people to join the fight against hate crimes.”

The 60-second spot, embedded below, features a host of performers including activist and actress Calpernia Addams, musicians Ashanti and Andre 3000, Arrested Development’s Portia de Rossi and singer/actress Janet Jackson.