Three friends hiking in the Grand Canyon were caught in severe flash floods that struck the area over the weekend. Dr. John Giusti, a 46-year-old chiropractor from Granbury, Texas, and Brent Rosenkranz, 42, were confirmed dead, according to their families. A third friend, Timothy Allen Smith, 53, is still missing as of Monday night. The group had entered the Grand Canyon on Friday, planning to spend two nights at Bright Angel Campground, explore nearby trails, and go fishing before heading to Havasupai Gardens. The flash floods, triggered by heavy rainfall, affected multiple areas of Grand Canyon National Park, including Bright Angel Canyon and Phantom Ranch. Authorities initially reported about 15 people missing, but that number dropped to one as of Monday night. Dozens of hikers were rescued over the weekend, but continued heavy rain on Monday made rescue efforts more difficult. In just two days, the Grand Canyon received nearly half a year’s worth of rain, leading to swollen creeks, mudflows, and damaged infrastructure. Many hikers described the experience as life-threatening. Erica Viola and her boyfriend had to run for safety after a footbridge was swept away. "He's yelling at me, 'Run, run,' and I'm going, 'I can't run any faster. I'm going to just die,'" Viola told CBS News. "Five minutes later we would have been washed." The National Park Service reported that nearly all footbridges over Bright Angel Creek were destroyed, cutting off pedestrian access. Rescue operations continued into Tuesday as officials searched for the missing hiker. An alert system installed in Bright Angel Creek was activated by rising water levels on Saturday, but it later went offline, leaving the cause unclear. The system, put in place after a wildfire made the area more vulnerable to flash floods, includes river gauges that send alerts when water levels reach critical points. Officials called this the most severe flash flood in recent memory, though it remains unclear whether the extreme rainfall was predicted. Meanwhile, the park faces additional challenges, including a damaged water pipeline that leaves only two weeks of water supply as the region enters peak wildfire season.