FBI via The Anchorage Daily News, Associated Press
FILE - In this undated photo provided by the Federal Bureau of Investigation via The Anchorage Daily News, Joshua Wade is shown. Wade is spending life behind bars after admitting to killing two Anchorage women. Anchorage police and federal authorities have scheduled a Friday, June 20, 2014 morning news conference to discuss whether Wade may have caused the deaths of persons in addition to Della Brown and Mindy Schloss.

ANCHORAGE, Alaska — A man convicted of murdering one woman and tampering with evidence in the homicide of a second has told an Anchorage television station he killed three other people.

Joshua Wade contacted KTVA-TV several times last winter to confess the murders and said he was bargaining information with authorities to get transferred to a prison outside Alaska, the station reported late Thursday.

Anchorage police did not immediately respond to the report. However, authorities had earlier scheduled a news conference Friday to discuss whether Wade may be responsible for more deaths.

Joshua Wade has admitted killing Della Brown and Mindy Schloss.

Wade, 34, was sentenced to life in prison in February 2010 in the 2007 death of Schloss, a neighbor who worked as a nurse practitioner.

"I deserve much worse," he tearfully said at his state court sentencing.

In a signed plea agreement for the slaying, Wade also acknowledged that he killed Brown, another Anchorage woman, in September 2000 by hitting her on the head with a large rock. Brown's battered, partially-nude body was found in an abandoned shed.

An Anchorage jury acquitted Wade of Brown's murder but convicted him of tampering with evidence, for which he served 6 ½ years in prison.

In telephone calls last winter from jail to KTVA, Wade claimed he killed someone else when he was 14 and five years later, strangled someone in a botched robbery.

The third additional death, he said, came the night Brown was killed. There was a man with her in the shed. Wade told the station he knocked the man unconscious, put him in the trunk of his car, and then went for drinks.

When he returned, he heard thumping in the trunk.

"And I opened it, nobody was around, it was dark, and pulled him out and pretty sure that I'd killed him that time by stomping on his head," Wade told the station, which didn't air the interviews last winter but did so Thursday night, after police announced the news conference. "I drove out to the valley, found a spot, took the guy out, took his clothes off and shot him in the head two times with a shotgun and pretty much took everything from the shoulders up."

Months after his release from the evidence-tampering conviction, Wade bound, gagged and kidnapped Schloss, shooting her in a wooded area near Wasilla.

Wade was sentenced to 99 years in prison for the murder of Schloss. A state court judge placed a restriction on the parole board to make Wade serve at least 66 years.

If Wade were to be released after that, at age 95, he would be turned over to federal authorities to serve out the remainder of a life sentence for murder committed during a carjacking.

That sentence was handed down in federal court, where Wade got into a heated exchange with U.S. District Court Judge Ralph Beistline, who called Wade heartless, selfish and a coward.

In an angry voice, Wade told the judge, "Don't push it, man."

Beistline responded, "I'm going to push it."

Wade repeated the threat, and the judge said the angry outburst was very revealing and underscored what a danger Wade would be if free.

Wade denied to the station he was a serial killer.

"Absolutely not," he responded. And his advice to people who think he is a serial killer: "Quit reading books."

Follow Rachel D'Oro at https://twitter.com/rdoro