A Colorado man is facing murder charges for allegedly killing his 8-month-old son and the baby’s mother last week. According to KCNC, David Weingarten, 29, fatally shot his infant son, George Weingarten, and his son’s mother, Lizet Salinas, 26, on February 1 in Colorado Springs. The couple’s 2-year-old daughter was at the residence but unharmed. …