( CNN ) -- A woman hospitalized after spending time in a sauna-like `` sweatbox '' has died , bringing the total fatalities to three , authorities said late Saturday . Retreat participants spent up to two hours inside the sweatbox , the sheriff 's office said . In addition to the deaths , 18 others were injured at the October 8 event at Angel Valley Retreat Center near Sedona , Arizona . The latest victim , Lizabeth Neuman , 49 , was a Minnesota mother of three . She died at the Flagstaff Medical Center , the Yavapai County Sheriff 's Office said . There were up to 65 visitors , ages 30 to 60 , at the resort attending the `` Spiritual Warrior '' program by self-help expert James Arthur Ray , according to authorities . Participants spent up to two hours inside the sweatbox , a dome-like structure covered with tarps and blankets , the sheriff 's office said . Hot rocks and water are used to create steam in the enclosed environment . Neuman 's attorney , Lou Diesel , told CNN her family is cooperating with the investigation and once it 's complete , he will `` take all the appropriate actions in response to those responsible for Liz 's death . '' Fire and rescue officials received an emergency call from the resort and transported the injured by air and land ambulances to nearby medical facilities , the sheriff 's office said . Two people were pronounced dead shortly after arrival at a local medical center . A homicide investigation into the incident is under way , authorities said . The other retreat participants who were hospitalized have since been released . Ray is widely known for programs that claim to teach individuals how to create wealth from all aspects of their lives -- financially , mentally , physically and spiritually . He has appeared on various national programs , including CNN 's `` Larry King Live . '' CNN 's Janet DiGiacomo contributed to this report .
`` Sweatbox '' retreat claims third victim , a Arizona woman . Retreat participants fell ill after spending late Saturday in hot , dome-like structure . Sweatbox program was led by self-help guru Ray . Police are conducting a homicide investigation into `` sweatbox '' deaths .