BOSTON (KRON) — Boston Marathon bomber Dzhokhar Tsarnaev’s fate of whether he will live or die rests on the decision of the jury who must consider mitigating factors against imposing the death penalty.

There are 21 mitigating factors cited by Tsarnaev’s lawyers that have been summarized by U.S. District Judge George O’Toole Jr.

The mitigation includes Tsarnaev’s age at the time of the attack and how much influence his radicalized other brother Tamerlan had on the 19-year-old.

Another factor to consider is Tsarnaev’s father’s mental illness and brain damage which caused Tamerlan to be the domninant male figure in Dzhokhar’s life, the defense argued.

They will also consider how remorseful Dzhokhar appeared.

Closing arguments will be made today and a verdict will be reached.