Former Navy SEAL and author of the best-selling book American Sniper, Chris Kyle, was one of two victims of a shooting that happened at a recreational gun range in Texas on Saturday. Kyle, who holds the record for the most kills in Iraq by a sniper, was at the range with veterans Chad Littlefield and Eddie Ray Routh when Routh allegedly turned his weapon on his fellow shooters. Investigators have arrested Routh, a 25-year-old former Marine. Though the shooter's motives remain unclear, it is believed that Kyle was trying to help Routh, who family members say suffers from PTSD …