Stalling by Dzhokhar Tsarnaev’s lawyers has blown any chance they had of using an insanity defense to save the Boston Marathon bombing suspect from execution, prosecutors claim.

Stating, “Tsarnaev was arrested over 16 months ago and trial begins in less than eight weeks,” the government for a second time last night asked U.S. District Court Judge George A. O’Toole Jr. to compel the 21-year-old Chechen national’s attorneys to turn over a list of mitigating factors for why he should not be put to death if convicted of the murders of three spectators and the injuring of 260 others at the April 15, 2013, Boston Marathon finish line.

Asserting the deadline for doing so has long passed, exasperated federal prosecutors said, “It is now clear that Tsarnaev will not offer evidence relating to a mental condition … Aside from a one-sentence disclosure notifying the government that an expert will testify about ‘relevant aspects of Mr. Tsarnaev’s life story,’ the defense has produced no information whatsoever about its case-in-chief.”

Federal law requires ample notification of a planned insanity defense to allow prosecutors time to prepare a counter attack. U.S. Attorney Carmen Ortiz’s office first asked to be notified of an insanity defense on April 11. O’Toole gave the defense a deadline of May 9 to respond.

The defense previously told prosecutors, “Tsarnaev will call a social worker who will testify about relevant aspects of Mr. Tsarnaev’s life history. (Her) testimony will be based on interviews and on her review of documents and records. To the extent that (she) will provide expert testimony as a clinical social worker, she will identify risk and other factors in the defendant’s background and environment, if any, that shaped his life.”

Tsanaev is scheduled to go on trial Nov. 3; however, the defense is trying to both postpone that date and move the anticipated months-long blockbuster to Washington, D.C., in hopes of seating a more impartial jury.

O’Toole has not indicated when he will rule on those motions. The next status conference on the case is Sept. 18. Tsarnaev, who has been held in solitary confinement for nearly 17 months, has not made an appearance in court in well over a year.

O’Toole denied the feds’ first demand for a list of mitigating factors, which was filed May 7. He left the door open for them to ask again after Tsarnaev’s lawyers dug in their heels and refused to cooperate voluntarily, arguing in court papers, “The government seeks an advance look at the defendant’s basic arguments for life — essentially, his theory for why he should be allowed to live if convicted.”