The cause of death for Kyle Marisa Roth, a Hollywood gossip at the age of 36, has been determined. Roth died of cardiac arrhythmia due to myocardial fibrosis, according to a post mortem report from the office of the chief medical examiner for the state of Maryland obtained by TODAY.com.

A heart arrhythmia is an irregular heartbeat, when it beats too fast, too slow or inconsistently, . Myocardial fibrosis is a condition caused by the buildup of scar tissue in the heart muscle, according to the . Anything that can cause damage to the heart can cause scar tissue, though heart attacks are the most common cause of myocardial fibrosis, according to the Oklahoma Heart Hospital.

Toxicology testing determined Roth tested positive for diphenhydramine, also known as Benadryl, and mitragynine, an alkaloid that can be used for pain management, and was negative for alcohol, according to the report. "An expanded toxicology panel sent to the Drug Enforcement Agency was performed which did not reveal additional substances," the medical examiner's office wrote in the report. Her manner of death was natural, according to the report.

Roth's death was announced on April 15 from her older sister, Lindsay Roth. “As a family we are still processing and deciding how to properly celebrate and honor her life. we don’t know happened yet.

i know she touched so many people with her humor, intelligence, beauty, gossip activism, athleticism and more — she had so many gifts,” Lindsay Roth wrote in th.