A volunteer editor flagged the post and notified the Web site's management, Ordonez said, before the company notified the police.
The writer claims in the "confession" that as speculation grew about what "personal reasons" may have forced Benoit to miss scheduled World Wrestling Entertainment events Saturday and Sunday, he or she latched onto a rumor online about the death of Nancy Benoit and posted it as "fact" on the Chris Benoit Wikipedia entry.
The Benoit entry, which has been updated hundreds of times this week, is currently locked due to "vandalism."
While there are ways to scramble IP addresses, police are often able to trace exactly where Wikipedia entries originate. "Authorities are usually very effective at figuring out where that IP address came from," Ordonez said.
Police say that Benoit asphyxiated his wife Nancy Friday, used a chokehold to kill their 7-year-old son Saturday and hanged himself with a weight machine cord early Sunday morning.
World Wrestling Entertainment contacted authorities Monday after Benoit missed scheduled events Friday and Saturday. The wrestling organization said the wrestler canceled his appearance at a Sunday night championship match, saying his wife and son were suffering from food poisoning. On Sunday, the wrestler sent a series of text messages to two of his co-workers simply listing his address. In another, he wrote, "The dogs are in the enclosed pool area. Garage side door is open."
The pro wrestling group also made "several attempts to contact Benoit via phone and text message," but hadn't reached him as of 11 p.m. Sunday, according to a WWE statement.
The WWE, which originally posted the contents of the text messages, has since stripped them from the pro wrestling organization's Web site.
The IP address from which the first Wikipedia addition -- and subsequent confession -- was made has been flagged for "vandalizing" other Wikipedia entries in the past, including a racist edit about troubled NBA star Ron Artest.
Another entry was edited earlier this month, apparently from the same IP address, about WWE wrestler Chavo Guerrero Jr., a close friend of Benoit's and reportedly one of the two recipients of text messages sent by Benoit over the weekend before the bodies were discovered.
In that entry, the IP user stripped an explicit and damaging description from the Guerrero post.
Chavo Guerrero is the nephew of Eddie Guerrero, another friend of Benoit's and a wrestler who died of heart failure in 2005. While he was reportedly clean at the time of his death, the coroner later tied the heart failure to longtime drug and alcohol abuse.
Jerry McDevitt, a lawyer for the WWE, told The Associated Press Thursday that no one at the WWE knew that Nancy Benoit was dead before her body was found Monday. "I have no idea who posted this," McDevitt said. "It's at least possible Chris may have sent some other text message to someone that we're unaware of. We don't know if he did. The phone is in the possession of authorities."
Authorities, who have ruled the incident a double murder-suicide and still have released no motive, also confirmed Thursday that federal drug agents and sheriff's officials conducted an overnight raid at the office of Benoit's personal physician, Dr. Phil Astin, in search of medical and prescription records.