Alexis Arquette's cause of death revealed, actress battled HIV for 29 years

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More than a week after Alexis Arquette died, her cause of death has been revealed.

The transgender actress' immediate cause of death was cardiac arrest, according to a death certificate obtained by ET. However, she was also battling HIV.

WATCH: Actress and Transgender Advocate Alexis Arquette Dead at 47

According to the document, Arquette was living with the disease -- the underlying cause of her death -- for 29 years. She suffered a bacterial infection of the heart three weeks before she died of a heart attack on Sept. 11 at the age of 47.

See photos of Alexis Arquette:

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Siblings Alexis Arquette (L) and Rosanna Arquette pose for photographers as they arrive to attend the sixth annual American Film Institute Associates' Platinum Circle Award ceremony to honor members of the Arquette family in Los Angeles, California May 10, 2006. [The AFI Associates Platinum Circle Award is given annually to honor a family whose creative contributions have enhanced the entertainment community.]
Members of the Arquette family (L-R) Alexis, Rosanna, Richmond, Patricia, and David arrive to attend the sixth annual American Film Institute Associates' Platinum Circle Award ceremony to honor members of the Arquette family in Los Angeles, California May 10, 2006. [The AFI Associates Platinum Circle Award is given annually to honor a family whose creative contributions have enhanced the entertainment community.]
Rosanna Arquette, Alexis Arquette and Patricia Arquette (L-R) arrive for the GLAAD awards at the Kodak Theatre in Hollywood April 8, 2006. REUTERS/Phil McCarten
Presenters Rosanna (L), Alexis and Patricia Arquette (R) smile at the 17th annual GLAAD Media awards at the Kodak theatre in Hollywood April 8, 2006. The Gay & Lesbian Alliance Against Defamation (GLAAD) Media awards recognize and honor mainstream media for their fair, accurate and inclusive representations of the lesbian, gay, bisexual and trans-gender community and the issues that affect their lives. The show will be televised on Logo, MTV Networks' cable channel, and VH1. REUTERS/Mario Anzuoni
Cast member David Arquette poses with his siblings Rosanna, Alexis, Richmond and Patricia (L-R) at a screening of "Sold" on the opening night of the Indian Film Festival of Los Angeles in Los Angeles, California April 8, 2014. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
HOLLYWOOD, CA - APRIL 08: (L-R) David Arquette, Rosanna Arquette, Alexis Arquette, Richmond Arquette and Patricia Arquette attend the Indian Film Festival of Los Angeles opening night gala at ArcLight Cinemas on April 8, 2014 in Hollywood, California. (Photo by Paul Archuleta/FilmMagic)
LOS ANGELES, CA - MARCH 30: Reality TV Pesonality Alexis Arquette attends the 2012 Miss Hooker pageant at The Dragonfly Bar on March 30, 2012 in Los Angeles, California. (Photo by Paul Archuleta/FilmMagic)
HOLLYWOOD, CA - FEBRUARY 11: Alexis Arquette arrives at UG Presents With The Embassy Presents: A 2012 GRAMMY Celebration at Hollywood Roosevelt Hotel on February 11, 2012 in Hollywood, California. (Photo by Amanda Edwards/WireImage)
LOS ANGELES, CA - MAY 13: Alexis Arquette arrives to Paper Magazine's 13th Annual Beautiful People Party held at The Standard Hotel on May 13, 2010 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
BEVERLY HILLS, CA - MARCH 10: Jessica 'Sugar' Kiper and Alexis Arquette arrive to the Pistol And Stamen/Christophe Salon/Edin Gail Cocktail Party at the Christophe Salon on March 10, 2010 in Beverly Hills, California. (Photo by Todd Williamson/WireImage)
WEST HOLLYWOOD, CA - JANUARY 26: Shangela Laquifa Wadley, Alexis Arquette and Sahara Davenport attend the 'RuPaul's Drag Race' Season 2 Launch Party at Eleven Restaurant on January 26, 2010 in West Hollywood, California. (Photo by Brian Putnam/Getty Images)
LOS ANGELES, CA - JUNE 24: Actress Alexis Arquette attends the premiere of HBO's new series 'Hung' at Paramount Theater on the Paramount Studios lot on June 24, 2009 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
HOLLYWOOD - SEPTEMBER 24: Actress Alexis Arquette arrives at the Fox Reality Channel Really Awards at the Avalon Hollywood club September 24, 2008 in Hollywood California. (Photo by Frazer Harrison/Getty Images)
CULVER CITY, CA - MAY 17: Actress Alexis Arquette attends Art Seen 3 featuring A Taste of Los Angeles at Smashbox on May 17, 2008 in Culver City, California. (Photo by Jason LaVeris/FilmMagic)
WEST HOLLYWOOD, CA - MAY 30: Alexis Arquette attends the Secret Room Celebrity Gifting Suite Day 1 for the 17th Annual MTV Movie Awards on May 31, 2008 at the Valadon Hotel in West Hollywood, California. (Photo by John M. Heller/Getty Images)
BURBANK, CA - JULY 22: Actor Alexis Arquette arrives at the Comedy Central Roast of Flavor Flav at Warner Bros. Studio Lot, Stage 23 on July 22, 2007 in Burbank, California. (Photo by Kevin Winter/Getty Images)
Alexis Arquette during 6th Annual Tribeca Film Festival - Alexis Arquette: She's My Brother Premiere at Clearview Chelsea West in New York City, Nwe York, United States. (Photo by Jim Spellman/WireImage)
Alexis Arquette with Models during 6th Annual Tribeca Film Festival - 'Alexis Arquette: She's My Brother' - After Party at Fig & Olive Downtown in New York City, New York, United States. (Photo by Thomas Concordia/WireImage)
Nikki Parrott, Alexis Arquette and Mathew Barbato during 6th Annual Tribeca Film Festival - 'Alexis Arquette: She's My Brother' Premiere at Clearview Chelsea West in New York City, Nwe York, United States. (Photo by Thomas Concordia/WireImage)
Matthew Barbato, director and Alexis Arquette during 6th Annual Tribeca Film Festival - 'Alexis Arquette: She's My Brother' Press Conference with Alexis Arquette at Clearview Chelsea Cinemas West in New York City, New York, United States. (Photo by Brian Ach/WireImage)
NEW YORK - APRIL 26: (L-R) Director Matthew Barbato, actress Alexis Arquette and producer Nikki Parrott speak during the 'Alexis Arquette: She's My Brother' press conference at the 2007 Tribeca Film Festival on April 26, 2007 in New York City. (Photo by Donald Bowers/Getty Images for Tribeca Film Festival)
LOS ANGELES, CA - DECEMBER 09: Actress Patricia Arquette (L) and actor Alexis Arquette at the after party for the FX Network's premiere screening of 'Dirt' at Republic on December 9, 2006 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
LOS ANGELES, CA - DECEMBER 09: Actor David Arquette (L), actress Patricia Arquette, and actor Alexis Arquette (R) at the after party for the FX Network's premiere screening of 'Dirt' at Republic on December 9, 2006 in Los Angeles, California. (Photo by Charley Gallay/Getty Images)
Alexis Arquette during The Trevor Project's Cracked Xmas 9 - Arrivals at The Wiltern LG in Hollywood, California, United States. (Photo by Jason Merritt/FilmMagic)
HOLLYWOOD - NOVEMBER 08: (L-R) Actress Alexis Arquette, Drag Queen Jackie Beat and Director/Director of Photography Randolph Mark Viverito arrive at the screening of 'My Name is Jackie Beat' during the AFI FEST 2006 presented by Audi held at The LOFT at Arclight Cinemas on November 8, 2006 in Hollywood, California. (Photo by Michael Buckner/Getty Images)
UNITED STATES - OCTOBER 26: NBC's 'Medium' Supernatural Soiree at the Stephen Cohen Gallery in Los Angeles, United States on october 26, 2006 - Alexis Arquette. (Photo by Mike FANOUS/Gamma-Rapho via Getty Images)
UNITED STATES - OCTOBER 26: NBC's 'Medium' Supernatural Soiree at the Stephen Cohen Gallery in Los Angeles, United States on october 26, 2006 - Alexis Arquette, Courteney Cox, Rosanna Arquette, Thomas Jane and Patricia Arquette. (Photo by Mike FANOUS/Gamma-Rapho via Getty Images)
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While Arquette transitioned to a woman in the early 2000s, her death certificate interestingly uses her full name, Robert Alexis Arquette, and lists male under sex.

Arquette's brother, Richmond, was the first to share the news of his sister's death.

"Our brother Robert, who became our sister Alexis, who became our brother Alexis, passed this morning September 11, at 12:32 am," he wrote on Facebook. "He was surrounded by all of his brothers and sisters, one of his nieces and several other loved ones."

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Sister Patricia Arquette also took to social media to pay tribute to her late sibling.

"To My first best friend - Cosmic Dancer," she posted to Twitter, alongside a YouTube clip of the T. Rex song.

"Thank you all for your love and kind words about Alexis. My hero for eternity," brother David Arquette tweeted shortly after.

RELATED: David Arquette Says Sister Alexis Does Not Identify as Transgender Anymore


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