Glee's Jonathan Groff has joined the film adaptation of The Normal Heart, Larry Kramer's Tony-winning AIDS play.

Groff joins previously announced cast members Julia Roberts, Mark Ruffalo, Matt Bomer, Taylor Kitsch and Jim Parsons in the upcoming Ryan Murphy-directed film for HBO.

Groff will play Craig, an early victim of the disease and the first lover of Bruce Niles (played by Kitsch, Friday Night Lights), a closeted investment banker who becomes a prominent AIDS activist.

As previously reported, Ruffalo – a co-star of the 2010 lesbian moms flick The Kids Are Alright – will tackle his first gay role playing Ned Weeks, the hero of Kramer's play about the early days of the AIDS pandemic. And Roberts has been cast to play the role of Dr. Emma Brookner, the only doctor in New York City taking the disease seriously. Parsons will reprise his role of gay activist Tommy Boatwright from the 2011 Broadway production.

White Collar star Matt Bomer will also play gay in the film, taking on the role of gay fashion journalist Felix Turner, who later becomes Weeks' boyfriend.

Production is slated to begin in New York City later this year for a 2014 debut on HBO.