Authorities announced an $8,500 reward Thursday for information leading to the capture of a fugitive wanted on suspicion of murdering his pregnant estranged wife two weeks before Christmas.Jesus "Alex" Arteaga Garcia, 28, allegedly knocked at U.S. Customs agent Maribel Arteaga's front door on the evening of Dec. 10 and attacked her with a long-bladed utility knife when she answered.The 28-year-old victim was two months pregnant when she was mortally wounded at her apartment on Santa Alicia Avenue in Chula Vista, according to police.The couple's sons, ages 4 and 6, were home at the time, as was the victim's live-in boyfriend, though he was in another room.Jesus Arteaga's gray Ford Ranger pickup truck was found abandoned in Tijuana the next day. The suspect, who filed for divorce from the victim in November, grew up in the northern Baja California city.His wife of eight years had worked as a Customs officer for about seven months.San Diego County Crime Stoppers is offering a reward of $1,000 for information leading to the arrest of the suspect. Cox Communications and the U.S. Marshals Service have put up $2,500 and $5,000, respectively.Anyone with information about the case is urged to call 888-580-8477. Tipsters may remain anonymous.