a jury in placerville , california , took less than two hours on wednesday to return a verdict for first-degree murder against colleen ann harris , known to family as ` grandma cokie ' .
mrs harris wept in court and covered her face as the verdict came back , sacramento bee reported .
colleen harris was charged in the 1985 shotgun killing of her then-husband , 46-year-old james batten .
her attorney argued the killing was self-defense because of ongoing abuse , and jurors acquitted her .
she could get 50 years to life when she is sentenced on june 5 that