Harry Morton died due to an irregular heartbeat

According to TMZ, an autopsy revealed Harry - who previously dated Lindsay Lohan, Paris Hilton, Britney Spears and Demi Moore - was suffering from a condition called cardiac arrhythmia, which is due to hardening of the arteries.

There were also no drugs or alcohol found in his system following his death.

A memorial service for Harry was held in early December, with attendees including Demi, Lori Loughlin and Stephen Dorff.

Shortly after Harry's passing, 'Mean Girls' star Lindsay paid a touching tribute to her "best friend".

Lindsay took to Instagram to share a photo of herself and Harry at the 'Bobby' premiere at the Venice Film Festival in 2006 and captioned the post: "Best friends. Best life."

Lindsay's mother Dina sent a touching message to her daughter.

She wrote in the comments: "So sorry my lil princess [praying emoji] he's always with you , watching over you baby (sic)"

And Dina also sent her prayers to Harry's family.

She wrote on a private account: "RIP Harry God has an angel...We will miss you .....Prayers to your family."

The businessman founded Pink Taco in 1999 and the brand paid tribute to the "visionary" following his death.

They said in a statement: "We are saddened by the passing of Harry Morton, the founder and former owner of Pink Taco. Harry was a visionary and restaurateur ahead of his time, and his contributions, both professionally to our brand and personally to those he worked with, were numerous.

"Our thoughts and condolences are with his family and friends during this difficult time."