Arquette died on Sep. 11 at age 47 after suffering from a heart attack

Credit: Amanda Edwards/WireImage

Alexis Arquette had been living with HIV for 29 years before dying of cardiac arrest on Sept. 11, PEOPLE confirms.

According to her death certificate, the 47-year-old actress and activist had a bacterial infection of the heart for three weeks and had been diagnosed with cardiomyopathy, a disease of the heart, three years prior. The underlying cause of death was confirmed as HIV.

PEOPLE previously reported that Arquette was was surrounded by family when she died from complications related to AIDS.

“The whole family rallied around her,” said a source of the star’s final hours. “And in the end they were always there to support her.”

“She had been suffering for a long time. She was sick for years,” the source continued. “At one point, she wasn’t able to leave the house; she was in bad shape. … Everyone knew [her death] was imminent. It was a matter of time.”

The source also said Arquette’s family “is doing as well as can be expected.”

“They all love Alexis very much,” added the insider.

The transgender trailblazer was recently honored at an intimate event in Hollywood on Sunday hosted by her close friend Sham Ibrahim, a fellow drag performer who met the star in 1999.

About 50 friends and fans were on hand for the party, and Arquette’s favorite artists – David Bowie, Tears for Fears, Madonna, the Killers and the Pet Shop Boys – played in the background, and the late star’s movies and homemade videos were playing on two TVs above the bar.

“This is the only way to keep her spirit alive,” Ibrahim, 37, told PEOPLE at the event. “I felt she deserved the fame and respect. To see the loss of someone so talented … I just stopped crying two days ago. ”

Ibrahim said he decided to throw the party at a nightclub because “nightclubs were her home. She was a true club kid.”

“There was nobody in this world and there will never be anyone like Alexis Arquette,” Ibrahim added. “The world has lost an amazing talent and it is heartbreaking.”