LAS VEGAS AP – A co-defendant in the O.J. Simpson armed robbery case told a judge Monday he would plead guilty to a felony and testify against Simpson and four others in the alleged hotel room theft of sports collectibles from two memorabilia dealers.

The plea agreement with Charles Cashmore, 40, of Las Vegas, ups the ante in the prosecution of Simpson. Cashmore can testify that guns were involved in the Sept. 13 confrontation with two sports memorabilia dealers at a Las Vegas casino hotel room, his lawyer said.