Lauren MacKinnon, sister of Lindsay Bires, speaks to the media about her sister while images of her sister are displayed on a monitor behind them. Columbia Police Chief Randy Scott and Palmetto Health Richland held a joint news conference to update the media on the hit and run investigation involving a nurse at Palmetto Richland Hospital. Lindsay Bires, 24, a cardiac care nurse at Palmetto Health Heart Hospital is in critical condition. KIM KIM FOSTER-TOBIN — kkfoster@thestate.com Buy Photo