Mick Jagger -- who was said to be on his way to New York on Wednesday to help with funeral arrangements for his late girlfriend L'Wren Scott -- wrote a touching tribute on his website to the 49-year-old fashion designer, who reportedly took her own life Monday at her Manhattan apartment.

"I am still struggling to understand how my lover and best friend could end her life in this tragic way," The Rolling Stones singer wrote. "We spent many wonderful years together and had made a great life for ourselves. She had great presence and her talent was much admired, not least by me. I have been touched by the tributes that people have paid to her, and also the personal messages of support that I have received. I will never forget her."

The Stones, who were touring Australia and New Zealand, have postponed the last seven shows of their tour, according to the band's website.

Scott hanged herself from an L-shaped doorknob in her Chelsea apartment sometime between 8:30 a.m., when she texted assistant Brittany Penebre, and 10 a.m. Monday, when she was found dead, according to the New York Daily News. An autopsy was performed Tuesday, but the results weren't immediately released.

The Daily News also said Scott's older brother, Randall Bambrough, was headed to New York to help with the funeral arrangements, but the coroner's office said as of Wednesday it hadn't heard from Scott's family.

Jagger, 70, began seeing Scott in 2001, after she had established herself as a force in the fashion world. Jagger's model daughter with ex-wife Jerry Hall, 22-year-old Georgia May -- who was reportedly close to Scott -- quit a modeling job in Melbourne, Australia, and was believed to be heading to New York.

In an essay in The New York Times on Tuesday, Scott's friend and former fashion writer Cathy Horyn wrote that the designer was going to announce Wednesday that she was closing her business, apparently because of money woes.

The Daily News reported that Scott was spotted last week, alone, on the Caribbean island of Mustique, where Jagger owns a mansion. The Daily Mail, citing a source close to the Stones, said Scott "harmed herself" about a month ago, an incident that was "hushed up."

The newspaper said there was no immediate response to that report from Jagger's camp, though they did slam tabloid reports saying the couple recently broke up.

"There is absolutely no basis in fact to this story," the spokeswoman said. "It is a horrible and inaccurate piece of gossip during this very tragic time for Mick."

Scott's designs were worn by everyone from Oscar winners Angelina Jolie and Sandra Bullock to first lady Michelle Obama. But her company was somehow in debt to the tune of nearly $6 million, according to the Daily News.

Jagger, whose net worth is estimated at more than $305 million, helped Scott financially on "numerous occasions," a source in the London fashion world told The News.

"Her business was in serious financial trouble," the source said. "Jagger put millions into it trying to keep it afloat."

Contact Tony Hicks at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.