The identity of the target has been a mystery since charges were filed on Friday.
However, law enforcement sources told the Post-Dispatch on Monday that the FBI found Frost at the player's apartment in Brentwood about midnight Thursday. That was minutes after Danton's accused teenage accomplice and a man she believed to be a hired killer had arrived there. That man had reported the alleged plot and was secretly working with the FBI.
The FBI brought the sports agent to the Brentwood police station, which is nearby, to talk with him along with the accused accomplice, 19-year-old Katie Koester Wolfmeyer, and the informer. Another law enforcement source who spoke on the condition of anonymity confirmed that Frost was that sports agent.
Frost has denied that he was a target of a murder plot. He told The Associated Press Tuesday that the the confusion will "all be cleared up as soon as Mike is able to talk."
"I wasn't the target," he told the AP
He refused to discuss specifics of the case with the AP or in an interview with the Post-Dispatch on Monday.
"The lawyers are the ones who will have to comment about the specifics of that night," Frost said.
"Once the whole thing shakes down, everyone will understand exactly all of the circumstances of what happened," he said. "When the smoke clears, everyone will know what Mike was thinking and what really happened. I can tell you that the moment he arrives in St. Louis is the moment a psychologist arrives to help him. We're in position to help him, and that is our goal."
Said Frost's lawyer, Michael Edelson: "There is a story behind the story which will be told eventually. Other than that, I have no comment. We're not going to try this in the press."
A possible motive for killing Frost was not immediately clear. Court documents said Danton and his intended target had argued earlier in the week about issues of drinking and promiscuity and Danton had begged him not to tell the Blues general manager and ruin his career.
Authorities later recorded a sobbing Danton telling the target in a phone call that he "felt backed into a corner and also felt the acquaintance was going to leave him," the complaint against Danton said. So Danton "decided to have him murdered."
Danton was arrested Friday in San Jose, Calif., as a result of a criminal complaint filed in the U.S. District Court in East St. Louis by the FBI. The complaint alleged that Danton offered $10,000 to a man in Monroe County introduced to him by Wolfmeyer to kill someone he allegedly told Wolfmeyer had been hired to kill him.
If convicted, he could be imprisoned up to 10 years and fined up to $250,000 on each of two counts - that he conspired and used a telephone across state lines to set up a murder. Wolfmeyer, of Florissant, was charged with the same counts.
Frost is not well-known in St. Louis but is known in Toronto's hockey circles for being banned from two junior hockey leagues and for having a strong influence over a core of young players.
Danton's father, Stephen Jefferson, called Frost a "monster" and blamed him for his dwindling relationship with his son.
Frost has said it is Jefferson who was the controlling figure in Danton's life, saying it was "well-documented" with Danton's Canadian lawyer and with Canadian regional police "what Mike has gone through and what he has had to deal with. . . . It is all eventually going to come out, and it will surface. This is really going to be a part of Mike's healing process."
Danton's St. Louis-based attorney, Robert Haar, said he had been in contact with the U.S. attorney general's office about when Danton will be transferred from a California jail to the St. Louis area.
It could take "two to three weeks," Haar said, but he had been assured that the process would be expedited. "I suspect (Danton will be moved) much quicker than that," Haar said.
After a weekend in jail, Katie Wolfmeyer was released on $100,000 bond Monday, to a collective gasp of relief among friends and family after a federal judge in East St. Louis ruled that she was not likely to flee the area. Her parents, Patrick and Nancy Wolfmeyer, posted the required 10 percent in cash.
Her bail hearing Monday shed some light on the man from Monroe County whom she had allegedly introduced to Danton to carry out the murder. Her lawyer, Don Groshong, told U.S. Magistrate Judge Clifford J. Proud that the man is a police officer - and that Wolfmeyer knew it.
Assistant U.S. Attorney Stephen Clark said the man was not a police officer but a "civilian employee." He didn't elaborate.
Authorities first became involved in the case when the man Wolfmeyer introduced to Danton called Columbia, Ill., police on Thursday after becoming convinced that Danton was serious.
Columbia officers contacted the FBI, Chief Joe Edwards said Monday.
Proud, the magistrate judge, noted Wolfmeyer's clean background.
"It is evident to me, Miss Wolfmeyer, that there is not so much as a parking ticket in your past," he said, shortly before releasing her to her parents' custody and under conditions of home confinement and electronic monitoring. "This is not to cheapen the seriousness of the offenses with which you are charged."
The family declined to comment as her bond was posted and as she left the courthouse.
Clark, the prosecutor, argued that Wolfmeyer should remain jailed. "This is a case where this defendant made calls to set up a murder," he said. "This is a crime of violence."
Groshong, of Alton, denied that Wolfmeyer signed a confession as reported in an FBI agent's affidavit in the case. He said she only admitted to certain facts.
"Miss Wolfmeyer has already cooperated, and by 'cooperated' I mean cooperated fully with the government so far. She will continue to do so," he said.
After the hearing, he described her as an honors student who is working two jobs, attending college and spending time as a lacrosse coach. And he called her a victim.
"Nobody contacted anybody to do a hit," Groshong said. "This is a young girl smitten by a hockey player who lied to her continually. . . . She's the victim. She's been lied to by everybody." Groshong declined to elaborate on who lied to her.
More than 20 people turned up to show support for Wolfmeyer. Some of them were her college classmates at St. Louis Community College-Florissant Valley, who skipped their classes to be there, Groshong said.
Wolfmeyer, who is studying nursing, burst into tears several times during the hearing, prompting family members and friends to cry in sympathy and exchange hugs.
John Wolfmeyer, an uncle of Katie Wolfmeyer's, said late Monday that the family was thrilled to welcome her home.
"It was great," he said. "There was a roomful of people waiting for her. Everyone was just happy to have her home. After a half hour, she actually stopped crying and started smiling."