Robin was last seen on the Chain of Rocks Bridge in St. Louis, Missouri at 11:25 p.m. on April 5, 1991. Robin and her 20-year-old sister, Julie Ann Kerry, had taken a visiting 19-year-old cousin from Maryland, Thomas Cummins, to the bridge to show him a graffiti poem they had painted there several years earlier. Several hours later, Thomas contacted police and told them four men had attacked him and his cousins, robbed him, raped the women and pushed them off the bridge into the river. Thomas then jumped off the bridge after being ordered to do so by the attackers. He saw Julie in the water, still alive, but they became separated, and he never saw her or Robin again. He was able to swim to shore and get help. Julie's body was recovered in Caruthersville, Missouri several weeks later, but Robin's remains were never located.