the way around the stall, and take extra care with the tile above the grout joint. you do not want to have to replace those too!
using a hammer and/or pry bar, carefully remove the tile and materials below you cut. you may have to use viking force and just hammer the heck out of it to get it out. if you are dealing with a mortar shower pan, it is likely that you will simply have to break it up and scrape it out. depending on the damage to the sub-floor, it may have to be replaced. with any luck you caught your leaky shower pan just in time, and 