Miss Fiore's short-lived husband and reality TV contestant Ryan Alexander Jenkins is wanted in connection with her death after her mutilated body was found stuffed in a suitcase.
But the Hollywood gossip website TMZ reported that she'd been texting ex-boyfriend Robert Hasman several times on Thursday evening and early Friday morning of last week.
And, in an eerie twist, it says that Hasman received a text message last Friday night from her phone, which said simply "suck it". It appears that message was sent long after Miss Fiore was dead.
TMZ has also obtained video showing Miss Fiore and Mr Hasman in the holiday resort of Los Cabos, Mexico, last month - just four months after she married the man now charged with murdering her.
A guest at the pool area told TMZ that the the two used aliases -- he was "Hans" and she was "Ginger".
Miss Fiore was identified by her the serial number on her breast implants after her fingers and teeth were "forcibly removed", investigators in southern California said.
In a separate development, Canadian police boarded a plane at Toronto airport and arrested a man they believed may have been Mr Jenkins. They later released the man after confirming it was a case of mistaken identity.
Mr Jenkins, 32, apparently slipped into Canada after driving and power-boating more than 1,000 miles from southern California after the corpse of his 28-year-old girlfriend, Jasmine Fiore, was discovered.
Her naked body was found in a rubbish bin in Los Angeles on Saturday. "The victim had been badly beaten, all of her fingers had been cut off, and all of her teeth had been forcibly removed," said a statement from the California prosecutors.
Canada said its security forces were looking for Mr Jenkins, who is officially described as a "person of interest" in the investigation into Fiore's death. "Police forces are on the lookout with the potential that he might be in this country," said Peter Van Loan, the Canadian Public Safety Minister.
Police believe Mr Jenkins reported her missing on Saturday night – after her body had been found - and then disappeared when detectives said they wanted to talk to him.
Mr Jenkins was a contestant on the VH1 reality show "Megan Wants a Millionaire", a US television show in which men with a net worth of at least $1 million vie to win a woman seeking to become a "trophy wife". He is variously described as an architect, property developer and investment banker.
He appeared in three episodes of the TV series "Megan Wants a Millionaire", during which he had to complete such tasks as designing a marketing campaign for her pet chihuahua.
Mr Jenkins' disappearance has sparked a media frenzy. A white car police believe he was driving and an empty boat trailer were found at a marina in the US border town of Blaine, close to Vancouver.
A man matching Mr Jenkins' description arrived by boat at Point Roberts, US territory about 10 miles away, at the tip of a peninsula which is reachable by land only from Canada.
Mr Jenkins's mother reportedly lives in Point Roberts and a local television station quoted a family friend, who said Mr Jenkins' mother went met him in Seattle, Washington, on Wednesday, saying it was a family emergency.
A preliminary coroner's report indicated that Miss Fiore was strangled.
Mr Jenkins appears to have met her in a Las Vegas casino after recording the VH1 series. The two were married soon after.
According to Miss Fiore's mother, Lisa Lepore: "they had a big blowout" in May and Miss Fiore had the marriage annulled.
Court records show that Mr Jenkins was charged in June in Clark County, Nevada, with a misdemeanour count of "domestic violence" when he was accused of hitting Miss Fiore on her arm.
Mr Jenkins was also charged with assaulting his girlfriend in July 2005 in Calgary and given a conditional discharge with 15 months probation.