Restaurateur Harry Morton’s grief-stricken family has spoken of their loss following his death, with preliminary tests indicating that he died of undiagnosed heart disease.

The 38-year-old founder of the Pink Taco eateries and son of Hard Rock Cafe co-founder Peter Morton passed away on Saturday and was found by his devastated brother, Matthew. In a statement, the Morton family told Page Six: “We are devastated by the loss of our beloved son, brother and friend. Harry was the brightest light in all our lives and his spirit will live on forever.”

Dr. Matthew Miller, deputy medical examiner at the Los Angeles County Department of Medical Examiner-Coroner, on Tuesday confirmed to the family that Morton had coronary artery disease with a mildly enlarged heart, a family spokesperson said. An autopsy was carried out on Monday, however, it was later deferred for further tests. The family is not yet able to hold a funeral for Morton while the tests are carried out, including microscopy of his other organs, the spokesperson added. However, they are planning a memorial service for him in Beverly Hills on Saturday.

A Morton family friend, Dr. Kathy E. Magliato, a leading cardiothoracic surgeon, confirmed through the spokesperson that Morton had calcification in three main arteries and suffered sudden cardiac death, an unexpected death caused by loss of heart function.

A source confirmed that Morton — a reserve deputy with the Los Angeles County Sheriff’s Department — had no drugs in his system. A family source said no foul play was suspected.

Morton died at his $25 million home in Trousdale. As Page Six reported, he had dined with his family, including his father, the day before his death and seemed in good spirits. His grandfather, Arnie Morton, is the co-founder of the famed Morton’s Steakhouse chain.

Sudden cardiac death, or SCD, is the single largest cause of natural death in the United States, accounting for approximately 325,000 adult deaths per year and responsible for nearly half of all deaths from cardiovascular disease. SCD is twice as common in males as compared to females and strikes people in the mid-30 to mid-40 age range. In over 50% of cases, sudden cardiac arrest occurs with no warning signs.