Citing a sharp downturn in ad sales, KSHB, Channel 41, terminated three employees, including the producer of the Emmy award-winning "Public Defenders" investigative team. The NBC affiliate, owned by E.W. Scripps Co. of Cincinnati, made the moves as part of a belt-tightening requested of all nine Scripps-owned stations. Management said the General Motors work stoppage earlier this year, which wiped out all GM advertising for several weeks, was a major factor. Station officials announced the changes to a stunned news staff Aug. 20. Some staffers, who spoke on the condition of anonymity, said they were "devastated" and "discouraged" over what they viewed as a body blow to the station's investigative unit. Kim Kruger, the "Public Defenders" producer, was a skilled projects leader; his replacement, Tom Christiansen, has no investigative experience. General manager Jim Swinehart said the only fair way to meet Scripps' request was to cut the people with the least amount of company seniority, and that meant Kruger. "As far as I'm concerned, we have not lessened our commitment to doing investigative work," Swinehart said. Kevin Petrehn moved from investigative to general-assignment reporting earlier this year, and Al Deal recently accepted a position in Atlanta. There were rumors that his position would not be filled, but Swinehart said a replacement for Deal is being sought. Two sports positions also were eliminated, a move Swinehart said was also related to 41's loss of Chiefs football. More than one staffer was appalled that sports producer Steve Mehl had been let go while reporter Alan Shope, whose position also was terminated, was allowed to take another position at the station as a news photographer. Shope, you may recall, recently served a one-week suspension, reportedly for digging through fellow reporter Lisa Holbrook's purse to have a look at her pay stub. Swinehart said that firing Shope at this point would be illegal. "These people were not fired for cause. This was a reduction in force," Swinehart said. "And one thing we do as company policy is that if there's an opening that someone is qualified to fill, you offer them the job." Part-time reporter Amanda Jahn is no longer working at 41, although Swinehart said that was not related to the other terminations. De Alva gets weekend work Christine de Alva, who joined WDAF, Channel 4, last year as a reporter, has been named the new anchor of WDAF's 7 a.m. newscasts on weekends. The native of San Jose, Calif., previously worked at stations in El Paso, Texas, and Chico, Calif. She will be teamed with meteorologist Joe Lauria starting Sept. 5. Got the blues each day A locally produced showcase of music from Club Mardi Gras, a blues bar at 19th and Vine, is going daily. "BTV: Blues Television," featuring guitarist Sonny Kenner, will begin airing at 8 a.m. weekdays on Time Warner Cable's Channel 4 Monday. Kenner will be co-host with Aquilla Tubbs. Tubbs and her husband, public-access TV veteran Taju Tubbs, produce the show. If you're a regular viewer of Channel 4 you've seen their work under various titles in the past, including "KC Jass Flavors," which also airs at 9 a.m. Mondays on KPXE, Channel 50. Laurie Everett returns to KMBC, Channel 9, Monday on a part-time basis following back surgery. She will appear on the 10 p.m. news only. Ronda Scholting has left KMBC to take a reporter's position in Denver. StarTouch: 889-7827 and enter 8852 (TVKC). E-mail: writeme@tvbarn.com.