James Holmes should be sentenced to death ... after suffering in prison for many, many years ... so says the brother of one of the victims in the Colorado massacre.
TMZ spoke with Steven Hernandez ... whose sister Rebecca Wingo was shot and killed, along with 11 other people, during the midnight screening of "The Dark Knight Rises" earlier this month.
32-year-old Wingo leaves behind two young daughters.
Prosecutors say they will consider pursuing the death penalty for Holmes -- but will not make a decision until they speak with the families of the victims.
Hernandez has already made up his mind -- explaining, "My sister Rebecca was killed in the theater. My mother is bereft, my wife is distraught and I am heartsick and angry."
"Allow the justice system to punish this murderer. I want to see him sentenced to death and I hope he sits in jail many years waiting to die."
Holmes has been charged with 142 counts for the shooting -- including 24 counts of 1st degree murder.
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