The Alford plea means the defendant does not admit to committing the crime, but feels there is enough evidence to be convicted guilty at trial.
The guilty plea came as a jury trial was scheduled to begin Monday morning. The first-degree murder charge against Usher, 37, was dropped as part of the plea deal.
Usher was arrested last year for the murder of Steven O'Brien, who was found shot to death in his Randolph Avenue Apartment in
Steven's sister Angie O'Brien says she was the one who found him dead.
"I found his body, he had been dead about 6 hours when I got there," said Angie, adding that she had been planning to meet her brother at his apartment that day. "Had I been there, [Usher] could have taken my life too."
Usher faces a maximum of 50 years in prison for the murder charge, and for one count of using a handgun in a crime of violence.
Two others were also arrested in connection to the murder, Eduardo Gonzalez and Jenaro Torres, who are brothers. According to court documents, their mother was dating Usher at the time.
The State’s Attorney’s Office says Gonzalez and Torres, along with Usher, planned to rob Steven of his cash and marijuana.
Court records show Steven sent out a mass text message on the day of his murder, saying he had marijuana to sell.
Gonzalez and Torres were expected to testify against Usher during the trial.
Gonzalez is currently serving a 25 year sentence for the murder after a plea deal was made in January, according to Cirincion. Torres was just 15-years-old at the time of the murder and is serving time at the juvenile detention center for an armed robbery conviction.
Steven's family says although the men responsible have been caught, the plea deal offers little relief from their pain.
"He should stay behind bars forever, for life,” said Angie, who also thinks Usher could still be a threat to society after 50 years in prison. She says Usher was out on parole for an armed robbery conviction when he murdered her brother.
Steven's family wants people to remember him as the kind and loving person they knew him to be.
"He was a bright kid, he enjoyed people, he had a lot of friends, he would do anything for anybody,” said Steven’s father John O’Brien. “He'd give you his shirt off his back.”
Usher's sentencing has not been scheduled yet.
Copyright 2017 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.