Lawyers for Boston Marathon bombing suspect Dzhokhar Tsarnaev  have asked a judge to order federal prosecutors to give them more time to make their case against the death penalty.

Dzhokhar Tsarnaev (FBI)

In court Monday, Tsarnaev's lawyers said they have not received key evidence from prosecutors yet and have not had enough time to submit a proposal arguing that Tsarnaev does not deserve the death penalty.

A prosecutor argued it's been almost six months since the marathon bombing, a "reasonable" amount of time for the defense to make its case. He said prosecutors plan to make their recommendation to U.S. Attorney General Eric Holder by Oct. 31. Holder will have the ultimate say on whether to seek the death penalty.

The twin bombings at the finish line of the April 15 marathon killed three people and injured more than 260.

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