Former nurse Heather Presdee entered guilty pleas this morning to three counts of first degree murder and 19 counts of attempted homicide. In all, 17 patients in five facilities died from insulin overdoses she administered. Five other victims survived. The 41-year-old serial killer was sentenced to three consecutive life terms. At least nine wrongful death lawsuits have been filed by victims' families against the nursing homes that employed Pressdee.