"Rumors that we're paying for Arias family house etc ... are absolutely untrue," he tweeted Saturday.
The accusations came from a tweet by Chris Stark, who describes herself on Twitter as a "Former BB Blogger & Casey Anthony Blogger" and "Paid Researcher," People reported Sunday.
"Dr Phil Production Company is paying for #JodiArias Family living expenses. Hotel and food TRAVEL for the last 94 days in Arizona," she wrote Saturday.
"Excuse: paying MOM Sandra for her daily NOTES she writes while the trial testimony takes place. Dr Phil paid license fee for photos and video of Arias Family Dr. Phil producer visited Jodi 2 times in jail so far per jailhouse visitor log," Stark continued. "Dr Phil paid Cindy Anthony $600,000 for her interview after the trial."
McGraw denied the allegations.
"I've never met the Arias family, and neither I, nor my ... production company – has paid or promised them anything. Robin and I are praying for the Alexander family," he tweeted.
Arias, 32, has admitted killing ex-boyfriend Travis Alexander in 2008 and lying about it for nearly two years, but insists she killed him in self-defense and has no memory of stabbing and shooting him, ABC News reported.