a 73-year-old grandmother was found guilty of first-degree murder on wednesday after gunning down her third husband while he was sleeping .
it took the el dorado superior court jury in less than two hours to convict colleen harris of murdering robert edward ` bob ' harris in their placerville , california home in 2013 .
decades before , in 1985 , colleen harris , a placerville land surveyor , shot dead her second husband and the father of her three children , 46-year-old james batten , after the el dorado superior court .
she stands to receive 50 years to life for first-degree murder with a firearm .