Utah teacher pleads guilty to killing ex's girlfriend in front of kids 02/23/2020 11:40 am PST Comments KSTU / Salt Lake County via KSTU: WEST JORDAN, Utah (KSTU) -- A former Utah high school health teacher pleaded guilty Friday to aggravated murder and other charges, admitting she shot and killed her ex-husband's girlfriend. Chelsea Watrous Cook, 33, went to her ex's apartment on Nov. 25, 2018, and fatally shot 26-year-old Lisa Vilate Williams in front of Cook's 3-year-old twins. Cook pleaded guilty to aggravated murder, aggravated burglary, three firearm-related felonies and two misdemeanor charges of committing a violent offense in front of children. Prosecutors allege that Cook had initially gone to her ex-husband's apartment that November evening to give her children cold medicine. MORE: Former Utah teacher pleads guilty to killing her ex's girlfriend as her children watched - The Salt Lake Tribune Former Utah teacher pleads guilty to killing her ex's girlfriend as her children watched - KSTU #Burglary #Conviction #KSTU #Murder #Plea #SaltLakeCity #Update #Utah Related Stories Police: Woman breaks in, kills husband's alleged mistress, then kills self Police: Utah teacher murdered ex-husband's girlfriend in front of twins Missouri woman convicted of 12-year-old murder of ex-husband Podiatrist, girlfriend conspire to kill doc's wife, vow to reunite Texas doctor accused of hiring hit-man to kill esteemed love rival N.J.’s Stephanie Parze case; S.C. wife poisons husband with eyedrops - TCDPOD Waiting for your permission to load facebook comments.