A woman accused of killing a taxi driver while under the influence pleaded guilty Thursday. Whitney Gettys admitted to drunk driving in connection with a January crash downtown that killed 32-year-old Semere Issac. Gettys ran a red light at Delaware and Washington streets in her Jeep Cherokee, slamming into the man’s cab. Gettys, 23, told police she’d had one shot of alcohol while working at a bar, but a test showed her blood alcohol content was more than three times the legal limit. Sentencing is set for this month.