PHILADELPHIA—A federal appeals court in Philadelphia will hear the appeal of a Pennsylvania woman convicted in a bizarre bank robbery plot that left a pizza delivery driver dead when a bomb strapped to his neck exploded.

A three-judge panel will decide before the Sept. 25 hearing if it will hear oral arguments concerning the conviction and sentencing of Marjorie Diehl-Armstrong.

Diehl-Armstrong was sentenced last year to life plus 30 years in prison in the August 2003 robbery that killed pizza driver Brian Wells.

Diehl-Armstrong appealed the conviction and sentence, saying she wasn't competent to stand trial and a defense psychiatrist was wrongly kept from testifying on her behalf.

Authorities say Diehl-Armstrong instigated the plot to get money to kill her father and later killed one of her co-conspirators.