The cause of death for Nicholas Brendon has now been officially confirmed following his passing earlier this year.

The actor — best known for his role as Xander Harris on Buffy the Vampire Slayer — died on March 20 at the age of 54.

According to a report released by the Putnam County Coroner’s Office on May 5, Brendon died of natural causes, specifically atherosclerotic and hypertensive cardiovascular disease.

What Happened

The coroner’s findings revealed that Brendon suffered from severe heart-related issues, including a 90% blockage in his right coronary artery.

Additional contributing factors included:

  • Acute pneumonia
  • A prior heart attack
  • Significant artery narrowing

The report also noted that Brendon had a markedly enlarged heart, along with other complications linked to reduced blood flow and inflammation.

Authorities confirmed there were no signs of foul play at the scene.

Final Days

According to the report, a close friend who was with Brendon before his death said he had been dealing with a persistent cough and chest pain, but declined medical treatment.

Despite recommendations to go to the hospital, the actor reportedly chose to stay home and self-medicate with over-the-counter remedies.

Investigators also reviewed videos filmed shortly before his death, noting his raspy voice and visible coughing, which reflected his declining health.

Family Statement

Brendon’s family previously confirmed he passed away peacefully in his sleep.

In a statement, they said:

“We are heartbroken… While many knew him for the roles he brought to life, those closest to him knew his passion for art and creativity.”

They also shared that although he had faced personal struggles over the years, he was receiving treatment and feeling optimistic about the future.

Career and Legacy

Brendon rose to fame in the late 1990s starring alongside Sarah Michelle Gellar, Alyson Hannigan, and David Boreanaz in Buffy the Vampire Slayer, which ran from 1997 to 2003.

He later appeared in films such as Coherence and continued working in television, while also developing a passion for painting later in life.