BOSTON — One prospective juror was brutally frank when asked whether he could consider a sentence of life in prison for the man accused of bombing the Boston Marathon. “I would sentence him to death,” he said, then added: “I can’t imagine any evidence that would change how I feel about what happened.” Another prospective juror said he couldn’t even consider the death penalty, telling the court, “I just can’t kill another person.” The two men are on …