Annie Lennox's Daughter Shares Heartbreaking Tribute to Boyfriend After Kayak Accident

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Tali Lennox-Fruchtmann, daughter of Annie Lennox, is paying tribute to her boyfriend, Ian Jones, after he was presumed dead on Monday.

The couple had been involved in a horrifying kayaking accident on Saturday, in which they were thrown into the Hudson River and became separated after the kayak flipped. A passing vessel found and rescued Lennox-Fruchtmann, who was uninjured, while a body matching Jones' description was discovered in the river on Monday. An autopsy has been scheduled for Tuesday in order to determine a cause of death and identification.

WATCH: Body of Annie Lennox's Daughter's Boyfriend Possibly Found After Kayak Accident

"My heart is shattered," Lennox-Fruchtmann wrote on Instagram Monday evening. "My best friend, my soul mate, my partner in crime & creativity, the LOVE & LIGHT of my life is no longer with me. All the love that has been sent to me is giving me the strength to get through this. I know that he is so so happy that I was safely rescued. Let us honor & celebrate this beautiful soul & keep following the light."

As ETonline previously reported, authorities stated that the incident appears to be an accident and no foul play is suspected. It was also revealed that neither Lennox-Fruchtmann, 22, nor Jones, 32, were wearing life preservers when the kayak capsized. Captain John A. Watterston of the Dutchess County Sheriff's Office also reportedly told People that "alcohol may have played a role."

UPDATE: Authorities have officially identified the body discovered on Monday as that of Jones. The Dutchess County Sherff's Office reports that the autopsy revealed no injuries or trauma to Jones' body, and his death has been ruled an accidental drowning. Toxicology tests were performed, although the results won't be known for several weeks.