PEABODY — Jaquan Huston, 23, has been ordered held without bail after pleading not guilty today on charges of murder in the stabbing death Saturday night of a fellow employee of P.F. Chang’s restaurant at the Northshore Mall.Huston is accused of stabbing Elivelton Dias in the back while they were both working in the kitchen of the popular establishment. Peabody police got the 911 call around 5:40 p.m,.Essex Assistant District Attorney Ashlee Logan told the court at Monday’s arraignment that Dias and Huston were both working in the kitchen at PF Chang’s when, according to a statement the defendant gave police, he believed the victim was saying something about him in Spanish. The defendant then allegedly plunged the knife into the victim’s back, Logan said.A Probable Cause Hearing is scheduled for September 28. Attorney Joseph Collins is representing Huston.