The Brief The family of NASA analyst Orville Landis is asking the governor to sign a death warrant for his convicted 1985 murderer in Tampa. Mark Davis was sentenced to death after robbing and killing Landis in an apartment off Gandy Blvd. Nearly forty years after a man was sentenced to death for a killing along Gandy Blvd., daughters of the victim are begging the governor to finally sign a death warrant. One whose death warrant was just signed, committed his crime just twenty years ago. "And obviously he is, because he is signing the death warrants.