Jurors who convicted Colorado theater shooter James Holmes of killing 12 people and injuring scores more must soon decide whether he should pay with his life.

Sentencing for Holmes begins Wednesday and could be even more emotional and polarizing than the 11-week trial.

Prosecutors will argue the July 2012 attack was particularly heinous because a child was among those killed and 70 defenseless strangers were wounded.

Defense attorneys will counter with evidence of Holmes' mental illness. They say that warrants a life sentence over execution. Holmes' parents, childhood neighbors and a college roommate could testify.

The sentencing is expected to take a month. Prosecutors may call some of survivors or victims' relatives to speak about the lifelong pain and heartache Holmes caused.