Laramie County District Attorney Leigh Anne Grant Manlove announced late Monday afternoon that charges have been filed against Wyatt Dean Lamb in the death of 2-year-old Athian Rivera. Lamb was arrested on unrelated warrants on Feb. 19 after the disappearance of Rivera, his then-girlfriend Kassandra Orona's son, triggered a search and the boy's body was found in a dumpster near the couple's apartment in south Cheyenne. Police four days later announced they had forwarded an affidavit of probable cause to Manlove supporting additional charges of aggravated child abuse and murder; and on March 4, District Court Judge Catherine Rogers ordered Lamb be held without bond pending trial and bond revocation evidentiary proceedings in the unrelated case.