WARSAW, Poland—The husband of two-time Olympic champion Justyna Kowalczyk was killed Thursday in an avalanche in the Swiss Alps, the Polish Mountaineering Support Foundation said. Sports climber Kacper Tekieli, who was 38, last posted on Facebook on Tuesday from Konkordia Hut in Fiescherthal, Switzerland. “He was most wonderful,” a post on Kowalczyk’s official Facebook page…