Jonah Shacknai released a statement with his ex-wife Dina Romano announcing that their son Max (known to friends and family as Maxie) died in the hospital Sunday.
Last week, the 6-year old son of the millionaire Medicis Pharmaceuticals CEO sustained critical injuries after falling down the stairs in Shacknai's Coronado mansion, known as Spreckles Mansion - the same home where Shacknai's 32-year old girlfriend was found dead on Wednesday, hanging from a rope dangling over a courtyard.
Max Shacknai was not responsive when the paramedics arrived on Monday. The boy had fallen from stairs and was not breathing and did not have a pulse, Coronado Police Chief Louis Scanlon said Thursday.
It is unclear whether Max ever regained consciousness in the time he was hospitalized.
Here is the full statement, which was released on Sunday night:
With great sadness, Dina and I convey the tragic passing of our beloved son, Max (affectionately known as Maxie). Despite heroic efforts on the part of paramedics and hospital staff, he was unable to recover from the injuries suffered early last week. His loving, kind and vibrant spirit will forever be in our hearts and those whom he touched every day. The loss to our families, Max's many friends of all ages and teammates, and the community is immeasurable.
We appreciate your respecting the privacy of our families during this time of grieving for Max. A private memorial service is being planned.
Memorial contributions honoring Max may be made to Whispering Hope Ranch Foundation either by mail to 9045 E. Pima Center Parkway, Scottsdale, AZ 85258, or via their web site, www.whisperinghoperanch.org.
On behalf of Dina, myself and our families, please know of our appreciation for the tremendous outpouring of support provided during this very difficult time.
The announcent came after law enforcement officials denied on Sunday that Max had died earlier in the weekend.
On Saturday, multiple media outlets quoted a Facebook message posted by Max's older sister Gabriele, indicating that her brother had died.
RIP Maxie. We'll miss your sweet smile and kind heart more than you'll ever know. I'll love you forever, San Diego's Channel 8 news reported the message read.
IBTimes was not able to locate the message on Facebook today; and it appears that Gabriele Shacknai's profile may have been removed altogether.
Coronado police spokesperson Lea Corbin told The Arizona Republic that there does not appear to be any connection between Max Shaknai's injury and the bizarre death of Jonah Shacknai's girlfriend, Rebecca Nalepa (also known as Rebecca Zahau).
It just seems to be a tragic accident, she said.
Rebecca Nalepa's dead body was found nude, bound, and hanging from the mansion's balcony on Wednesday.
Jonah's brother Adam Shacknai made the discovery, and told police that he cut Nalepa down after finding her. Both her ankles and wrists were bound.
This is a very bizarre death, there's no doubt about it, San Diego Sheriff's Capt. Tim Curran told reporters.
There are some very unique ways people can take their own lives, Curran added. If it was determined to be a suicide, people will do some very bizarre things.
Mary Zahau-Loehner spoke to ABC News about her sister Rebecca's state of mind before the gruesome discovery, saying that when the sisters spoke on Tuesday night, things with Rebecca did not seem out of the ordinary.
She was normal, fine, just getting ready to go to bed, Zahau-Loehner said.
A San Diego kennel owner who spoke to Nalepa on Tuesday said the woman was shaken by the recent events at her home.
It is believed that Jonah Shacknai was not home during his son's injury nor when Rebecca's body was found, and there have been reports that Rebecca was his designated caretaker at the time of the fatal injury.
Shacknai and Nalepa had been dating for two years.
There has been no explanation yet from the medical examiner's office about how Nalepa might have hung herself while her wrists and ankles were bound; nor has there been any information disclosed about the material used to bind them.
Land records show that Shacknai, 54, whose Scottsdale, Arizona-based company is the maker of the acne treatment Solodyn and wrinkle-filler Restylane, purchased the 27-room landmark property known as the Spreckels Mansion in October 2010.
From 1977 to 1982, Shacknai served as chief aide to the House of Representatives committee with responsibility for health policy, and in other senior legislative positions, according to a bio on Forbes.
He was also a member of the Commission on the Federal Drug Approval Process, and the National Council on Drugs.
On Thursday, Medicis had its sharpest decline in stock price since February.
Police have sealed all evidence related to the case, including search warrants and Nalepa's autopsy report.