According to the New York Times,
Blacks who kill whites are significantly more likely to face the death penalty in Maryland than are blacks who kill blacks or white killers, according to a state-sponsored study released yesterday. By itself, the study found, the race of the defendant was essentially irrelevant.
[…]The report found that two counties with the highest death sentencing rates, Baltimore and Harford, were also the two counties with the highest rates of capital homicides involving white victims and black killers.
The report also found that choices made by prosecutors about whom to charge with a capital crime accounted for almost all of the racial disparity. Later decisions by prosecutors, judges and juries had little impact.
[…]Maryland has executed three men since capital punishment was re-established there in 1978. Eight of the 13 men on death row today are black, according to the study. All 13 were sentenced to death for killing whites, it said, though 55 percent of the victims in all cases in which the death penalty was or could have been sought were not white.
I can’t say I am surprised, though I would like a national study attempt to isolate the effect of the race of the victim.