Tracking down the 600 LGBTQ people killed in the US in past 20 years.

Vigil participants leave their flameless candles on the bench dedicated to Matthew Shepard after a vigil to in remembrance of the 20th anniversary of his death on Friday, Oct. 12, 2018, at Prexy's Pasture on the University of Wyoming campus in Laramie, Wyo. (Photo: Timothy Hurst/The Coloradoan)

More than 600 LGBTQ-identifying people have been killed in acts of violence in the United States and Puerto Rico since Oct. 12, 1998, the day Matthew Shepard died at Poudre Valley Hospital in Fort Collins, Colorado, after he was brutally attacked near Laramie, Wyoming…