RestaurateurHarry Mortonwas mourned at a memorial in Beverly Hills on Saturday, one week after reportedlysuffering a heart attack.

A source tells PEOPLE there was an invitation-only gathering at Morton’s father Peter Morton’s home after the funeral. Guests included Harry’s exDemi Moore, Lori Loughlin, Mossimo Giannulli, actor Stephen Dorff and oil heir Brandon Davis.

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Demi Moore

Morton, who founded the Pink Taco restaurant chain,died last Saturday at the age of 38, a spokesperson with the Beverly Hills Police Department confirmed to PEOPLE at the time. A source previously said that his younger brother Matthew Morton was the one to find him unresponsive.

On Wednesday, Matthewbroke his silenceabout his brother’s death, writingon Instagram, “On Saturday I lost my big brother. Harry is that rare person who means so much to so many people in so many different ways, but to no one, could he be more meaningful than he has been to his little brother.”

Matthew went on to encourage his followers to reach out to their own siblings, as well as urge other men to check up on their heart health.

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Harry Morton

Morton had suffered froma coronary artery disease— which is a narrowing or blockage of the coronary arteries — and a “mildly enlarged heart,” his family spokesperson said ina statementto multiple outlets on Tuesday.

The Los Angeles County Coroner’s Office previously told PEOPLE that though an autopsy was completed on Monday, Harry’s cause of death had officially been deferred pending additional investigation. They have still yet to confirm his official cause of death.

Harry was best known for founding the trendy Mexican restaurant chain Pink Taco. The company — which has locations across the country, including in Los Angeles, Chicago, Boston, Las Vegas — issued a statement about Harry’s death shortly after the news broke.

Morton was romantically linked to numerous Hollywood actresses, including Moore, Lindsay Lohan, Paris Hilton, Britney Spears andJennifer Aniston.

source: people.com